Your question is slightly unclear due to performance pressure during sex you fear sex? If so you can reduce it by simple technique like mastrubating two hours before sex this will help you in combating premature ejaculatory disorder. Also I would advice you to consult a certified competent experienced clinical sexologist to help you with your issues. You can consult the doctor online too via lybrat e or practo. Deep breathing exercises and progressive muscle relaxation exercises will help you further. You haven't mentioned if you are suffering from erectile dysfunction too, however kindly consult a certified sexologist at the earliest.
Next Steps
Consult a good competent clinical sexologist
Health Tips
Practice relaxation techniques and mastrubation before sex