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My penis is very weak. Its only 4.5inch. And its not that hard. I ejaculate very quickly, i ejaculate simply by watching porn not even by masturbating. I have weak erections. I think the reason for all these is because of excess masturbation. I am very worried as to how am i gonna have intercourse if its very weak. Is there any cure for this? Is there any way i can strengthen my penis and make it last longer?

4.5 inches is about average size, and if you research shallow penetration, you will find that it's the fastest way to give a girl a squirting orgasm. It's also why bigger dudes do shallow sometimes as a technique.

And as far as prematurity goes, it's just a muscle. Start getting into the habit of practicing start/stop techniques when you jack off. Slow it down, divert your mind for a sec from the act, then back to it.
This way, you will eventually train yourself to last longer.

yes there are excercises you can do at home for this problem.
you need to see a doc about this its pretty common dude so dont worry to much about it unless your doc says otherwise
but damn lucky you are to ejaculate handsfree thats a true gift

i wouldn't worry about it. based on your "quesitn", i doubt you'll be having sex in this lifetime.