Dear Welcome to HCM We understand your concerns I went through your description. Your problem is not unique. this often happens with so many yougsters. I sincerely suspect that you do have anxiety problems than sexual impotency or erectile dysfunction. You are unmarried. You are leading a sedentery lifestyle and that is leading you to think unnecessarily. First you should visit a psychological counselor and ally all your fears and doubts about sex and masturbation. Then according to his advice, visit a sexologist who might diagnose whether you have impotency / erectile dysfunction etc. Don t diagnose yourself for you are not a physician. Hope this clarifies your doubts. Available for further queries. Good luck.