Sex performance anxiety?

Ok so I've been reading these ED posts, and I'd like to tell my problem and maybe(hopefully) Somebody can give me some helpful advice.
The first time I had sex I was very drunk and could harldy get it up, luckily the girl i was with was very good at keepn me goin and I did end up havin sex. She said the reason I was havin trouble was because of the alchohol. But, then the next girls I would try to hook up with I would get really nervous. I have had sex with another girl, since my first. But, like the first time she was able to keep me goin, and i did eventually have sex with her. But, other than those two instances I have been nervous wen I'M about to have sex. Everytime I'm about to have sex I think about the other women I didnt do it with. I recently was in a relationship were I once again had trouble gettn an erection, I would be hard durn foreplay but wen it came time to do it I was limp. My only guess is that this is peformance anxiety because I'm afraid I'll be limp, then I actually be limp. I work with my ex and have to see her alot, shes datin someone else now and its really got me ina state of mind that I really dont need to be in. Any advice would help