When I can't have the career or love life I want, what's the point of my adult life?

I wish I could have become a neurologist, but since I pass out at the sight of blood I couldn't go to medical school. So I have to accept a pointless job, that basically has no positive impact on the world. I came out at a lesbian a few years ago, and it was a huge mistake. I didn't know just how bad the dating scene was, or I never would have come out. I hate that coming out made me want things I can't have, that are unrealistic for me to want (obviously I think about what my life would have been like if I were straight, and it pisses me off). So I'm missing out on the career and the love life I want. Why on earth would I want to continue living, then? These are the two things I really wanted out of being an adult, so there's no point. Idk why I should bother anymore.