Brief Answer:
Need slight adjustments, Mostly psychological

Detailed Answer:
Thank you for asking

I read your question and i understand your concern. Performance issues in young age are mostly psychological and due to increased intimacy frequency. Reducing coital frequency to no more than twice a week fixes problems on its own most of the time.

Premature ejaculation is mostly due to the inexperience and doing it wrong. With passage of time one learns to control his sensations and time. Deeper coitus with minimal rubbing of glans, use of condom, morning time for intimacy with minimal epinephrine levels, use of desensitizers creams for delaying ejaculation etc are some of the tricks to help premature ejaculation. Anything that can help reduce the glans sensitivity and friction to the glans is gonna help increase time frame of intimacy.

Rest assured there isn't a single sinister thing at age that young as yours which can cause permanent damage or something serious. If you feel like you need help despite above mentioned measures, talk to a sex therapist and let him help you play this game of hormones better.

I hope it helps. Take good care of yourself and dont forget to close the discussion please.

Regards
Khan

---