Post relationship problems.

Hi guys, im 24 and i've recently come out of a 7 year relationship during which we talked about the things you see in this forum. my real trouble now is that I was quite dependent on those fantasies for stimulation and now im in a new relationship, things just arnt happening if you get my drift. its taking me excessive amounts of time to get an erection and even then it wont last long, i dont cum at all. Its fine when im by myself or when we're together but I know I cant do anything with her cos we're in company or whatever. i have discussed all this with her and shes being very understanding but it really is affecting my confidence and even my work. Does anyone else have similar experiences because i really could do with some advice on this.

thanks in advance

ok thanks for the replies guys. I think its all about re-educating my mind to find normal sexual contact a turn on again.