I just don’t feel understood

Now this isn’t some deep emotional post. I just don’t feel understood. I am exhausted, no matter what. I go to school full time and work about 25 hours a week. Yet I’m still exhausted. I always hear shit about how “oh you don’t do anything” “you shouldn’t be tired”. I can’t stand it. Why do people think they have a right to tell me how tired I am? I literally fall asleep while just sitting down watching several nights a week. My fiancé doesn’t even understand, he thinks I’m overreacting. I am just so frustrated.