It seems that your problem is not in your penis but in your mind. Sexual desire does not depend upon the penis but it originates from the brain and testicles. In other words, sexual attraction and sympathy do not depend upon the penis but from a person’s mental occasions. The penis only responds to the emotions created in the brain.

It does not seem logical to claim that until 6 months ago everything was OK when even before that you weren't involved in any love relationship. It is also very strange that you stopped masturbation 2 years ago. It appears that in the last 2 years you didn’t have any kind of sexual pleasure.

Beside a person’s mental nature, the male hormones produced by the testicles (testosterone) have a crucial influence on sexual desire. You can visit a urologist or internist to check if there is some type of organic reason (hypogonadism of any type) for impotency and lack of sexual desire. If there is no organic reason for your problem then the remaining possibility is that a psycho-emotional imbalance is causing the issue and you will need help from a psychiatrist or a mental health professional.