I had sex for my first time a few days ago. my girlfriend and i enjoyed it a lot, but i cummed very early.. is it normal? i'm a bit worried.

Normal...: I hope you are using condoms or some form of safer sex protocols. Premature ejaculation can occur. Try sensate focus exercises, masturbation or a ssri such a zoloft (sertraline).

Yes: If it becomes a recurrent issue then you should consult your doctor. Don't forget to use condoms. Some condoms are coated with a numbing agent to make your penis less sensitive to help prolong the encounter and decrease the chance of premature ejaculation. Hope this helps.