Problems with erections.

Patient: I have been finding hard to have an erection every since 2 days ago. I woke up and find my penis have decreased in size. I also find that I have lose my sex drive and I find it harder to get an erection. In the past, I can get a erection just by thinking about sex or some erotic images but now I can’t. I been masturbating daily but now I’ve tried to limit myself and I’m not sure if it’s going to work. I’ve also realised the lose of sensation when masturbating and ejaculating. I have been masturbating since 11 and I have never felt anything like this. I just what everything back to normal. May I know what is causing this? I’m 14 and weighing 44.3kg and I’m 1.63cm tall.