How do I not go insane over a crush

I know this is something that’s very common, but I feel highly neurotic whenever I have a crush and I hate it. I think I may have a crush on someone right now and i’ve been noticing that i’ve been so much more self conscious. I have this scenario play out in my head and I find every single reason there is to believe that whoever I have a crush on is way out of my league (even though I don’t even believe in that) and that it would never work out. I just want to be normal when I get a crush, I feel like every time this happens to me I get in my head and don’t ever end up doing anything about it. I’m not usually a very self conscious person but when I think I have a crush on someone i’ll place them on a pedestal and place myself way below. Any advice?