hi..thanks for writing..i have understood your concerns..
what i feel weak penis means erectile problems..and losing stamina means ejaculation early before you desire..
first of all, the size of penis shud not bother you..because size does not matter..in porn movies, all are professionals and they use medications for prolong erection, they are of different race and depending upon that size of penis varies,.. if your penis size is of more than 3 inches in erection it is sufficient..
weak erection may be due to
anxiety related to sexual performance or partner satisfaction or feeling of failure...
stress in work or family and other issues also interfere with sexual pleasure and erection...
for
erectile dysfunction you shud spend more time in foreplay before going for penetrative sex..try to control your anxiety with exercises,
yoga, relaxation exercises..
if you ejaculate early then it can be easily control with behavioral echniques as well as drugs..
in my opinion you shud
consult a psychiatrist or
sexologist for you problems..there is nothing like shame in seeking professional help..tell details about your problems..the doctor will explain you about reason of sexual problems, hoe psychology id connected to eat?..he will guide you through treatment strategy..
do not believe in rumors prevalent in the community and in uneducated people about penis size, sexual problems and night fall..
i hope this advice will be helpful to you...best luck...