I seriously hate how few straight women there are nowadays because I'm in love with an LGBT girl.
Is this girl part of your group of friends?
She might be, but she's in a relationship.
I'm sorry that you fell for a LGBT girl. It's better you respect her sexual preferences and move on with your life.
I can't because I want to be with her. I want her to be straight so that I can go out with her.
Their sexual orientation isn't something that you can or should want to change. It's not about you. You'll have to just accept this, there are still plenty of straight women out there.