Why is it that I get really hapoy or really sad at certain times?

okayk
My mood fluctuates so much, but during like different times. Like it's either I'm super sad for months or weeks... and then I'm super happy and didn't know why I was sad for a couple week too. And it's real annoying and I don't know what's wrong with me. Any advice/ideas?
Why is it that I get really hapoy or really sad at certain times?
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