How does sex feel?

I've super curious of how does sex feel... But when I sometimes think about it
it scares me because it will be my first time... and I heard it hurts... please tell me how it feels if u had experienced it with the opposite sex.....like girl and boy I think I literally don't know if I'm bi or something... I don't know but I'm attracted to boys but a little bit attracted to girls.. ╥﹏╥