It's a clear case of some kind of fear your heart n mind has imbibed.
First of all keep out of mind that you are week. When you do courtship next time, kiss and do foreplay, determine that you will not do intromission this time.
Take your partner into confidence for this. Play only for some episodes. Let erection compell you. Do not let your penis have friction against
vulva. Try best to kiss, caress and foreplay and let her do whatever she does. If she wants
oral sex let her do. Leave yourself independent of any thought. If you resolute, do not mind. It may go like that for few episodes. Since you have taken her in confidence, she would understand.
You will see that some other day your inner conscience will allow you to do penetration automatically with full confidence and act will be performed. Maintain this method.
Dietwise, soak almonds overnite. Morning crush or grind it. Light fry with little clarified butter. Mix little sugar or honey. Eat by CHEWING well. Do not take food till you are strongly hungary. Continue it daily. Keep gut clean by Tarunikusumakar chooran at night with warm water.
There are some Semen strengthening herbs too which, I think is not required for you. The method given above will make you the winner.
Thank HCM when you achieve it which will be very soon.
It will help you 100%.