When i masturbate i m done in 2-3 minutes. why is that ? m i too weak ? how to prolong it ?

Sex techniques: Sex techniques are described in various publications. Choose a serious andsincere reference. Simple techniques are to slow down, pause every 10 seconds or so, listen to music, focus on your partners pleasure, with pauses.

Can be normal: Just because you are done in 2-3 minutes, doesn't mean you are weak. To prolong it you could do what Austin Powers suggested and think of Margret Thatcher naked on a cold day. (No offense meant to Ms. Thatcher) ;-) In other words, think about something else.