well I just started talking to a guy that I really like.We agreed that we will be only friends with benefits and that's fine. I have had sex before but I'm always scared and really shy when its with a new guy and my main fear is being on top I'm not really good at it and I keep making up excuses not to go see him one day I know he is going to stop trying but I just want to stop being so scared, nervous, shy and do it but I cant and always end up saying no I really need help what can i do?