Sexual Dysfunction. Help me out of it.

In the year 2017, i went to endocrinology test and found that i have thyroid of 5.15 and i was obese (fat) at that time. And now at present i went to thyroid test, results are 4.00. I weight about 110 kgs and coming to problem. I used to masturbate a lot due to sexual desires. The problem is i cant make my penis hard, but i can still masturbate while do it my penis will stand within no time after that it falls out. In this year of jan 1st, i went to sex worker to have sex with lot of desires. But unfortunately i have no luck. I couldnt even insert into her vagina. My penis isnt strong. Even i tried a lot to make it hard but isnt hard. While doing masturbate it is getting hard and after taking hand it is falling out. From that time im depressed. I want to the best sex life as other. I didnt even have a girl friend . Im 22 years. I dont know what is the problem. Help me out my penis isnt hard for long not even a minute. I dont drink or smoke even. Please anyone could help me out of it.