How to stop being so emotional?

For a while probably since October of 2021, I have been super emotional for no apparent reason. Like it got pretty embarrassing because I was posting sad quotes and all that on Instagram and Snapchat. It has been going on from then up until maybe a month ago. Last week at night one day, I was really overthinking and I deleted everything on my Instagram except the account. Like no pictures, no bio, no profile picture, nothing. Then last night, I was thinking again but in a positive manner and I brought it all back and even followed all my friends again. I realized part of why I was sad was because I had no posts to look at on Instagram or Snapchat of others to pass time just to see what others are up to. I unfollowed them because I have this thought that everyone secretly hates me and is just talking to me because they don't want to seem mean and since they hate me they talk bad about me and talk bad about every one of my posts. I know that is probably not true but it is just what happens at night and sometimes in the middle of the day. So my question is, how do I stop getting myself in a bad/sad mood? I can go from really really happy to like devastated sad because of these thoughts
How to stop being so emotional?
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