Hi there ~
Firstly you might need to consult an psychiatrist
to find out if you have any difficulties in your libido or have other mental health concerns like depression
. Otherwise, you have a very common problem of erectile dysfunction
and / or premature ejaculation
and it can be easily treated with medications available during this time. The class of medication is called phosphodiesterase 5 inhibitors (PDE5Inh) selective serotonin reuptake inhibitors and it also helps with decreased libido which is a result of depression if you are going through one. I advise you to consult with a qualified psychiatrist who might be able to help in this regard. I hope this helps.
Take care and have a lovely day!