Dear Sir, I Am Mr. Xxxx At 31 Yrs, Height

Dear Sir,

I am Mr. xxxx at 31 yrs, height 5ft 4inch, weight 64kgs, unmarried. I am suffering from very poor confidence in erection since my early 20s.
I started a practice of sex with bed means I used to press my penis against bed as if I lie over a woman. As I apply back forth motion my penis erected. I continued such process of apparent having sex against bed until the penis gave the feeling of ejaculation. While performing I used to imagine my women of choice. At one stage I became very weak and my urge for the practice of bed sex declined to none.
Eventually it seemed to me that my penis is not strong enough to have sex with women. But I have never had practical experiences of sex.
At this age I do not feel the courage to get married because I got the feeling that my penis is very small. It is 2.5 inches in normal condition. Even if sometimes my penis erects it ejaculates in 1-2 minutes. Also I get irregular night falls.
Now I have no confidence to undertake marriage because I feel my penis will not erect before a women in bed. Also have suspicion even if it erects it will ejaculate in less than one minute before entering vagina. Also feel it will not get hard enough to be able to insert. I feel as if I am scared about marriage.
Would you please suggest probable treatment, including doses and duration, for me to help restore my sexual capability? Is it treatable ?

Best Regards,
Mr. xxxxxxx
Agartala,Tripura,India.