How do I care for this body of mine when I don't really feel like it's my body?

Yet i know that this will always be my body, I can't have a different body, I can only make changes to it. I gotta be patient, but I don't see any sign of things getting better.

Half the time, I feel like I'm just an actor playing a role, like I'm stuck playing a guy's role in some sitcom because that is what the director (life) wants me to play. If this is the best it gets for me, I don't know if it's worth living.