I can't poop, but i am not constipated. what is this called and how do i get over this?

Outlet constipation?: When you say you are not constipated i presume that means the stool is not hard. Difficulty passing soft stool is what we call "outlet constipation", meaning the mechanics of passing stool are not working well. Can be narrowing of the anal canal or lower rectum, spasm of the pelvic floor muscles or conditions such as rectocele. There are several colon and rectal surgeons near you. See one.