Am I alone?

I feel so alone. I've just moved again but this time seems so much different. I usually move to a place where I don't know anyone but this time i moved to the same town as my best friend in the whole world. But her issues are holding me back. I'm a 21 year old artest and that's the only way I can pay rent but this month i've been on such a road block i can't make rent. I'm afraid i'm letting her dramas get to me. I already have depression, anxiety, post-tramatic stress and body-dysmorphic disorders. She wants to get a place with me when our leases are up but i don't know if i can work with her around. I love her as a friend. She has always been there for me and visa-versa.
i feel cornered because i've always been here for her and she has always been here for me no matter what and now i feel that she needs me the most but... but i have my own issues to deal with. I move so much i don't think i even want to be here anymore. I really want to keep traveling. That's all i want to do but realistically, the way things have been going with my art work i don't know if i even can.
i don't know what to do. Be Loyal to my ultimate best friend or be Loyal to myself. at such a young age i wouldn't regret any decision i made because i can always travel but that's been my life for the last 7 years. How do you give that tendency up? But how do i give up an actual genuine friend?
I don't know what to do...