Muscle pain

Since December 31, I have been have a really bad pain in my right leg, is a pain that goes from the waist to the knee, sometimes it gets to hard the pain that I can even move it, it’s like a cramp but more hard. I have gone to the doctor twice, the first time I went he said I didn’t have anything and I was just my muscle tense that I should do some exercise and take a pill. My whole family think that whatever I am fell is psychological and that I am crazy and they got tired of me because it hurt me. The pain didn’t stop and my mom took me to the doctor again and he told me again it was nothing, and of course he find anything because the pain it in there for a few second then it goes away, he also told me i was something psychological and nothing to worry about. Now I feel like I am crazy because apparently I have nothing. But how is that people if I feel it, I c ant even move leg!! Ugh! I am so frustrated!