I feel sexually satisfied when masturbating, but almost never satisfied with a partner either premature ejaculating or difficulty maintaining an erection.
Male, 28 YO
No medication, normal testosterone level (700)
No health issues
You can get a family doctor to verify that the problem is not physical; if not, you may need a sex therapist. A clinical psychologist might be able to refer you. If you have been using porn that could be part of the problem.