I don't know what I'm doing with my life...?

I just turned 24 and I feel like I'm having an age crisis. I've been working as a bartender for the past three years, a nanny for nearly six years and have at part time job as a dog walker. I have a brand new car, live in an apartment with my boyfriend, and I guess I just thought I'd have accomplished more with my life by now.

I have attempted to go to school (Vet School...but putting an animal down would just kill me and Physical Therapist but they only accepted 40 out of the 90 some that applied and after wasting 80 hours of required volunteer work for that class and not getting in I don't want to do it again and not get in)

I know I cant be a nanny for the rest of my life, most families frown upon bringing your own children while watching their children and I hope to have a few of my own one day. I refuse to work in a child care facility as I make twice as much as a nanny. Bartending is great money most of the time, but most bars are owned my men who want to hire Barbie look a likes and I am far from Barbie material hahaha. I have tattoos, a lot of them, I like the freedom that both jobs give me (I like being able to go to the beach, the park or go for a run any time I want and I don't know if a nine to five job would allow me to do that) not only that but I honestly have no idea what I would like to do with the rest of my life...I've gone back and fourth with this whole career thing, I just want something that will make me happy for the long haul and I have no idea what that is. I've thought about going into the medical field but I don't want to clean up poop and puke (from a child is one thing but an adult is completely disgusting) I went to school to work on cars and love working in shops but I couldn't see myself doing that for more than a year.

I don't know I just feel so lost...please tell me I'm not alone with this whole life, career and happiness thing...