Darkvision to a range of 60ft and Blindsight of 10ft

You have resistance to your dragon type's primary element. If you are a red sealed dragon you have resistance to fire, if you are a white sealed dragon you have resistance to cold.

When you reach 1th level you may once per long rest, using your action or bonus action, briefly unseal yourself and morph into a wyrmling of your associated dragon color for up to a minute, or when the form is dropped by a bonus action. A white sealed dragon would morph into a white dragon wyrmling, gaining similar physical stats. However, health remains the same, when knocked unconscious in dragon from you revert to humanoid form unconscious.

When you reach 5th level you may instead morph into a young dragon of your color type, gaining 50 temporary hit points(available until form is dropped).

When you reach 10th level you may instead morph into an adult dragon of your color type, gaining 100 temporary hit points (available until form is dropped).

when you reach 15th level you may instead morph into an ancient dragon of your color type, gaining 125 temporary hit points (available until form is dropped).

When morphing all equipment on you melds into your being, and reforms upon the end or release of the transformation. While morphed you lose all class and subclass features, mental stats such as Wisdom, Intelligence, and Charisma stay the same. Physical stats such as Strength, Constitution, and Dexterity are those of the assumed form. When assuming the new form you do not gain its' legendary actions or resistances, where multi-attack is noted you instead make two attacks instead of three (bite and then one claw attack). Generally spell-casting ability is up to DM's discretion. Most adult dragons have some degree of innate spell-casting, so carrying over the spells your sorcerer can do can work, however, most young dragons have very little or no innate spell-casting at all, making the argument of being able to cast from your sorcerer's spell list obsolete. As a rule, adult dragon form can cast from your spell list normally, young and wyrmling forms cannot. Some specific class features do carry over, active barbarian rage can carry over, but mostly your class features are replaced with those of the dragon's (such as frightful presence). DM's discretion as to what carry's over and what does not. 

as a bonus action you can sport your dragon wins from your back you gain 30ft of flying speed

Your base walking speed is 30 feet.

Your Charisma score increases by 2, and your Strength score increases by 2.

Dragons reach maturity at around the age of 100, they however are not bound by a limited lifespan and can live for as long as they are not slain. The oldest recorded dragon in history was said to be over 4000 years old.

Sealed dragon is alignment is quite similar to the natural alignment of their corresponding dragon type. A chromatic type sealed dragon has a high chance of being evil or chaotic neutral, while a metallic dragon type has a high chance of being good or lawful neutral. However, due to the  uniqueness of their situation, sealed dragon alignment is not always dependent on color, and as they age most sealed dragons gravitate towards a true neutral alignment.

Sealed dragons tend to be closer in build to humans and elves. Your size is medium.