what to doo

alright so i am not the type to be speaking about this, but i feel like i should. I'm already 21 and I am a gay male, but I never in my life had a boyfriend. And I think it's because I am not attractive at all, should i keep thinkjng like that? Should I change what I don't like about myself? :( i dont wanna end up dying alone with several cats. What should i do?