I am suffering from a case of anxiety. I always keep checking that whether I am getting an erection or not. Most of the times I get erection thinking about sexual thoughts and watching any sort of erotic videos. But sometimes I can not get hard watching those specific videos and thinking about those erotic stuffs. Another thing is that whenever I masturbate my penis gets full hard and I get rock hard erections. But I have to stroke my penis constantly in those situations. Whenever I fail to achieve erection while about sexual stuffs I get into depression and I get stress out. Few weeks back I had a good sexual encounter with my girlfriend. I am getting worried very much when I can not get rock hard erections thinking about my sexual encounters. But most of the times I get hard erections. Another thing I am getting morning night erections and mornings erections most of the days. This problem is happening with me for the past 1 month. The main is that I always keep inspecting whether my penis is fine or not. Whether I am getting a solid erection or not. Most of the times I succeed but sometimes also fail. Whats my problem?