On masturbation my sperm comes out early within a minute.. do i have any sex problem?

Slow down: You're young, so it's not unusual to ejaculate quickly, especially if you're not masturbating frequently. I suggest taking some control over your orgasms. Stop before you come--take a break, and then go back to it. With practice, you can make this last as long as you want to, which will make you a better lover when you're with someone else.