Ok, I really want to play a ranger, but I can not decide on which subclass to play, I wanted to be able to fight well but have survivability. My first impulse was beast master, but I’ve heard it’s broken and horrible. Is that true?

is there a viable beast master build?

There definitely are viable beast master Ranger builds, but most of them have you being a gnome or halfling and mounting your animal companion to gain the benefit of the companion's movement speed & mounted combat. Beast master is also a bit clunky at lower levels since you can either attack yourself, or command your companion to attack, you can't do both, it gets better as you level and its damage output, is still quite decent despite it being clunky.

This being said, the beast master subclass of Ranger doesn't contribute anything towards the survivability of the Ranger other than putting a creature between you and your opponents (in some builds extra movement as well). Some subclasses of Ranger that increase survivability directly are the following.

Gloom Stalker has 3 features devoted to defense with Umbral Sight's invisibility (somewhat situational, Level 3), Iron Mind (Level 7), & Shadowy Dodge (Level 15).
Hunter has 2 features dedicated to defense at level 7 and level 15, both you can pick to combat the creatures you typically fight in your campaign.
Horizon Walker has 2 features focusing on defense: Ethereal Step (Level 7) & Spectral Defense (Level 15).
Lastly, the Monster Slayer has 3 features at level 7, 11, & 15 that increase its survivability, that being Supernatural Defense, Magic-User's Nemesis, & Slayer's Counter.

If you really want to play beastmaster check out Brewksys guide:
https://www.dndbeyond.com/forums/class-forums/ranger/75472-beast-master-ranger-strategy-tips

Keep in mind that there are no mechanics for easily reviving/replacing your companion once it dies (which it will eventually becasue of the abysmal ammount of hp it gets).
"If the beast dies, you can obtain a new companion by spending 8 hours magically bonding with a beast that isn’t hostile to you and that meets the requirements."
Good luck with that in the middle of a dungeon, especially since you will probably be looking for quite exotic things like Giant Crabs and Giant Poisonous Snakes.

The class feature variants brought in some new options, semi spirit animals, the Beast of the Air and the Beast of the Earth. Their HP calculation is slightly better than the 4x ranger level a normal beast companion gets, and they come back quicker. Also keep in mind that they can technically attune to items, and there are some good homebrew items out there that can help keep them alive. Rangers are overall a class that requires a good DM who wants to work with you to make your build work -- favored terrain and favored enemy don't do much good if you never end up in that terrain or fighting that kind of enemy. In the same way, the DM should work with you to make the beast companion work, which might include homebrewing rules for the beast, or items, or something else.

That said, I've been playing a Monster Slayer ranger as a ranged attacker, and most of the time I'm well out of range of combat (longbow + sharpshooter) so my survivability is pretty good. Combat tends to be simple -- point and shoot -- but I do pretty good damage.

I've had great success with the Gloom Stalker subclass. The Dread Ambusher is a great skill and insanely fun. It could really be useful for your build by using extra speed to move far away before the encounter starts in earnest and do some extra damage. The WIS bonus to initiative can be huge too, allowing you to really shine at the beginning of combat, especially if you're dual weilding.

And besides the other skills already mentioned, having rope trick around can get you out of some situations. Add in Great Invisibility and Stalker's Fury, and you've got a finesse fighting machine that can be versatile with magic.

They're really fun to play, give it a try!

I am having a blast with my rogue (scout) 4 ranger gloomstalker 3. The two sinc really well together and using hand crossbow give me a bonus action attack when needed.  But really like the Gloomstalker. Have a dm that loves encounters when we're resting. So to have a character that is basically invisible at night is a lot of fun lol.

Depending on where you're playing (and who with), your DM may also allow the UA revised Ranger mechanics (https://media.wizards.com/2016/dnd/downloads/UA_RevisedRanger.pdf). This adjusted a lot of stuff re Beast Master especially, and at least for my campaign, made the beast companion the most dependable damage dealer of our party. You won't be able to find it officially on D&D Beyond, and you wouldn't be able to use it in anything like Adventurers League, but it does try to even out some of the general complaints of the Beast Master subclass. 

There are some nasty Hunter combinations out there, for melee and ranged focus characters.  It’s always been a favourite of mine. 

I go with hunter almost exclusively, it's on the same level as a fighter if you build it right (Highest score in DEX, 2nd in WIS, 3rd in CON, 4th in CHA OR STR, 5th in STR or CHA, and 6th in INT) and then you add spells putting it on the next level.

I also go with ranger almost exclusively.

My first bit of advice would be to not touch a beastmaster.  Now, CAN you make a good beastmaster?  Yes.  It's much easier though to pick trap choices and leave yourself hurting.  You'll have to spend a lot of time combing though, looking for the perfect beast companion, then pray that your DM doesnt kill it and leave you with something lame.

now, that warning is out of the way, there are several competitive ranger subclasses out there.  Horizon walker, hunter and gloomstalker all have a lot going for them.  Playstyle will help determine which selection you make.  For example, horizon walker, imo, does not lend itself to being a dual wielder due to its dependacy on your bonus action.  I absolutely love it as an archer though, and the spell list is positively first rate.  Gloomstalker is great, specially if you're going to find yourself in dark places often.  Hunter is all around solid if...somewhat uninspiring.  If you like throwing damage dice, hunter's a pretty good way to do so.