I just don’t understand my emotions

I’m supposed to start my period in four days and I don’t know if that has anything to do with this or not but I have just felt like lately I have been carrying all of the burdens of the world on my shoulders and I don’t know what to do! I can be completely fine and someone can say something that doesn’t even effect me but it’s just sad and I just want to cry so bad and it just upsets me so much I

don’t know why.