Is there something wrong with me?

About twice a month i get in these moods where I feel sad,pathetic,and worthless. I get really down and start putting myself down and thinking bad thoughts about myself ex: im pathetic, im nothing, ill never be anything, im stupid and ugly, nobody likes me.... I even imagine other people are thinking the same thing and talking about me and when i see others around me laughing i feel as if their laughing at me. Thankfully these phases go away within a day or two, still, i dont like feeling this and i dont know why this happens i think it might be q mix between depression and schitzophrenia or im just crazy i dont know either way please help