You know I got laughed at too but then I learned how to do this thing with my tongue and all the laughter stopped!
I agree with this,
it would be interesting to see a poll whether women actually preferred a perfect tongue to a perfect penis?
Sorry to hear about your bad experience, but yeah she's clearly a horrible woman. If you do as everybody suggests, start with a beginners routine, and be patient, you will not only start to see size gains, but your penis will become healthier, and erection quality alone will give you more confidence, and erection quality does really seem to impress women a lot, it really isn't all about size.
As mentioned above buddy, get good with your tongue and your fingers, and it won't matter if you even have a penis at all. In the meantime, your penis is "work in progress".
Also, 4 inches is enough to give a woman an orgasm! She may have missed out by being so immature. That's her loss!