anxiety about orgasms

So this might be stupid but I guess I just wanted to get this off my chest and maybe get some advice. I was in a relationship a long time ago where the guy got really mad at me for "taking too long to finish." He screamed at me that I was the most selfish bitch he'd ever been with and it was clearly my fault because he'd "never had this problem with any other girl." Even though I'm in a new relationship now I still get so much anxiety when we're intimate that I just fake it every time.