strength issues

I am a 31 year old man who has had physical strength problems most of my life(such as lifting heavy objects like a man my age should be able to -like 30 40 pounds is too much for me) I am tired of being thought of as less of a man and almost losing a relationship with my daughters mother beacause im not a "real man" I am otherwise healthy except having 3 seizures in my life that are now controlled by meds (dilantin)otherwise nothing else medically Im wondering if i might have a undiagnosed disorder if one exists because i walk alot am in otherwise fit shape i do not have any health care coverage now because of prohibitive costs i am wondering it is so embarrassing.