Hi doctors. i am suffering premature ejaculation...and i can't satisfied my girlfriend what should i do?

Take some: Deep breaths and relax. Most premature ejaculation is caused by anxiety. Talk w/your gf and do more foreplay. Experiment a bit. Don't jump right into it. If everything else fails, talk with your doctor as there are some medications you could try.

Sexuality: First consult with your doctor to rule out medical issues, if cleared consult with a clinical psychologist who can help understand the cause and help you improve your functioning through awareness and possibly lessening anxiety. My best.