Please help me!

This is not so easy to write. Im sure alot of people are suffering the same as me. I have come to a point where i am clueless on what to do anymore.

I am age 32, and have been suffering with this for over 3 years now no doctor seems to want to help just tell me it gets better its self or prescribe me stupid tablets that dont even work. I have tried so much over the last 3 or 4 months to have sex with girls and no it just wont stand up it will not get hard at all only time it does is during masterbation and even then it flops what is going on please help me