Should I run away from home?

I'm 21 years old and I'm tired of my veins being pulled on by people like I'm not an adult. I'm tired of doing stuff that I don't want to do but others want me to. I wanna enjoy life. Life is too short to be worried about taking treys in for McDonald's, working on meaningless motor skills and controlling my animals noises. I'm thinking about running away to Myrtle Beach and become a beach bum, looking for mermaids and sea monsters. I just want my independence.

I'm just really worried about how it'll effect my parents.

Well who doesn't want independence and a carefree existence? Everyone does. But we don't run away from our houses and roam on the beach because we know we can't survive that way and certainly our families will miss us. The idea is ridiculous, if you ask me.
Instead see if there is a place where they will pay you to act, dress and make sounds like you want Perhaps a children's amusement park???

I agree that surviving outside on your own will be *a lot* harder than you expect I am afraid. Also, as you know, it will worry your family. I hope however you find places where you are more able to make animal noises and express yourself as you feel happiest doing.