Erectile dysfunction. Should i do now?

Myself venkat 23 years old and I have been suffering from erectile dysfunction for a long period. Till now I never experienced strong and stiff erection and not even 90 degrees concept. I experienced delayed puberty, almost at the age of 17-18. But I started masturbation at the age of 16.That time I didn't get any sperm. But within one year I saw a few drops of semen.Later it increased by little more. Then I started masturebating daily and some times 2 to 3 times in a day. Even that time it was not much stronger. But I used to experience that happiness.  Almost for 5-6 six years I did this. Now my penis is in  flaccid state almost.Sometimes it erects but not able to stand for a long time.  Two days back I tried to have sex, but I couldn't make bcoz its not strong at all. I'm not even experiencing morning erection.(Very rarely)  I never experienced 90 degrees only.  I went for a few tests, testosterone, FSH and LH harmone test. Doctor said everything normal. What should I do now?