Does being gay mean I'm bound to be bad at science subjects?

Hey everyone! I'm pretty much mad right now because I have a test on Monday about Applied Mechanics and I don't get a lot of the stuff!! First, it's a little bit difficult, honestly just a little bit. But secondly, I can't stop thinking about gay sex and webcaming and my stupid ex who is extremely hot to a point where I can't even, you know? I can't fucking even.Does being gay mean I'm bound to be this dumb? Cuz I kinda am when it comes to Mathematics.Anyone can relate to this? Any advice?Thanks