I'm crushing hard on a guy I think is straight
Okay, but when do you think you started crushing on him?
During our group project. I know he's busy getting it done with his girlfriend though
That's cool you finally have a crush, but I feel like you're better off trying to pursue someone that is still single and not in a relationship. Feelings may get hurt if you try to get yourself in a relationship with someone that's already in one.
It's okay because I have my hand and toys, it's not like I'm going to force him or anything.
It's okay to do sexual activities on your own and it is recommended that you just find someone that has no attachments with someone else so that no feelings are hurt. As long as any sexual activities you will do on your own or with others are legal and consensual, you are free to do whatever you want.