I don't believe in premature ejaculation. It's not as if you shoot out semen before you orgasm; when you come, you come. You want to last longer, and that's fine, but it's not a medical condition, no matter what ad companies want you to believe.
If you're quite young, it's especially understandable to not last long, but there are things you can do. You can concentrate on making her orgasm first; there's a book that Dr. Sue Johanson (she's no longer on the air, but you can get info from her show at
http://www.talksexwithsue.com/) would recommend, SHE COMES FIRST. I forget the author, but if you can get a copy, it might be helpful to you.
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Maven
If I had a dollar for every time I got distracted, I wish I had some ice cream.
Equal Rights Are Not Special Rights