help please

On a serious note, I think my mental health is bad. Today there was that guy who talked about my failed attempts to solve an equation (easy for most) but I just laugh it out as a joke, but now I'm crying and I can't seem to stop, I mean my brain knows it's not so bad and that it was just one question but I don't know, it's like my tears have a brain of their own. I just want to laugh it off but why does it hurt?. I know I've been bottling it all up for a while now but I don't think everyone doesn't do the same. Maybe I'm just weak, yeah I know it sounds attention seeking but emotions aside, I want to understand how it works so that I can fix myself. This app is not as trendy as tiktok or insta but that's why I'm here, I want advices from people who are emotionally available and intelligent. Could someone explain how I can stop myself from feeling this?