Am i gay?/what should i do?

I'm a highschool junior and I am very popular at my school and its this senior guy that I think I kinda like. A lot of pple say that he is bi and I believe it cus of the way he be acting with his friends is alittle gay but I never seen him actually with another guy I always seen him with girls and he say he isnt. I only have one cl with him and he always messes with my friend who sit next to me that is not gay at all he mess with him by calling him big dady and tuching him alittle and puttin him in wrestling moves from the back n stuff and that makes me think he is bi. I dnt want to b gay I have only had with girls and never think about gay or even gay oral but I think about it whn it comes to the senior boy. I dnt talk to him at all we never talk out of my three years at my school so if I tlk to him about this its going to be very embarrising and I don't want it to get around the school because he is also a popular dude and everybody knws him too and it would destroy my last two yrs of highschool. I dnt want to have actual with him I think I just want to have oral where I do him. So should I try to talk to him about it or not....and do this make me gay or is it just a phase and whn he graduates will I just forget all about this? Remember he graduates soon so I. Have to act fast.