Welcome to HCM.
You haven't mentioned your age, whether married or not etc.
is a subjective feeling.
Most of the individuals can remain in the vagina for 1-3 minutes only. Not more than that. Foreplay can be extended for any longer time as they wishes and got trained.
Ejaculation time will be still shorter for those who have long abstinence and people who are very young because of hyper-excitement and stimulation. This will get settled in due course.
There are other ways to satisfy your partner about which your sexologist
will guide you.
There is nothing like Pre ejaculation weakness.
There are other good drugs available to extend the ejaculation time and have to be used with the guidance of your physician.
So consult a Sexual Medicine Specialist and get a nice sexperience.