\"Sexology\
Hi, You are just 22 years and in prime youth period without any Chat Doctor.  Your difficulty in maintaining the erection is due to your anxiety to wards pressure performance probably following your previous bad experience with sex or due to some misconception regarding sex. Nothing to worry. A sexologist can rectify your problem, and you will be alright. Regarding improve your sexual performance, you can try pelvic floor (Keels) exercise regularly. You can observe a good improvement within few weeks time. Your sexologist will explain about the Keels exercise, or you can get it from online browsing. Wish you happy days ahead.