I'll like to ask how to do it. I'm straight but I always wanted to be jerkoff when I'm getting fuck in the ass, but everytime I try to take the step and get with someone their attitude pull me back

just let it flow!!!

find a dude who you're comfortable with..AND attractive towards, get to know a little about them..email/IM back and forth, then hook it up...that's what I did my first time.

You are straight and yet you want to be fucked in the arse and jerked off.
You at least Bi jd