Thanks for consulting. I have carefully worked through your case, and I can realize your health worries. Being your physician, I assure you not to worry as I will take care all of your medical concerns. kindly abstain from masturbation. do not worry every beginner has some time to adapt. so do not take any medication for this. from your history you do not have any form of erectile dysfunction or low sperm count. it is because you have shifted from masturbation to intercourse you have the initial problems. which you will control slowly. try to avoid masturbation and involve in intercourse and relax and believe it is normal. Hope it helps. If you need further, detailed and quick assistance related to any health issues in future, feel free to ask me a question directly from my profile. Have a wonderful time ahead. Best Regards! Dr. Arunmozhi varman