While there are surely advantages to being a hybrid, there are a number of ways in which the deer half of a centaur is a detriment to the humanoid half.

As you lack the lower body of a humanoid, you are unable to wear humanoid armor below the belt (ex: leggings, greaves, or boots).

Unless your hooves are in some way obscured, you have disadvantage on Stealth checks when walking on hard surfaces, such as stone, brick, or glass.

Any climb that requires hands and feet is especially difficult for you because of your cervus legs. When you make such a climb, each foot of movement costs you 4 extra feet, instead of the normal 1 extra foot.

Being born in the wild has made you accustomed to the dangers that the wild brings. By embracing the poisonous plants of the forest, you are able to resist poison. You have resistance to poison. You also have proficiency in the Nature skill. You have advantage on survival checks to navigate in the wilderness.

Accustomed to life in the dark woods, you have superior vision in dark and dim conditions. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light.

The Elaphocentaurs is much more agile than most. Their traits are very similar to that of a generic centaur with a few differences, mainly speed and dexterity compared to strength. Your Dexterity score increases by 2, and your Wisdom score increases by 1.

Elaphocentaurs reach adulthood in their late teens and live less than a century.

Elaphocentaurs tend toward Chaotic Good, Chaotic Neutral, and Neutral Good. The best and the worst are found among them but most of them are rather good because of their shy nature.

Elaphocentaurs stands just over 5 feet, with their deer bodies reaching about 3 to 4 feet at the withers. This makes their total average height around 8 to 9 feet. Your size is Medium.

Your base walking speed is 40 feet.

You can speak, read, and write Common and Sylvan.

If you have not taken dash as your action, you can instead use dash as your bonus action.