I do this a lot too. Or rather, I try to. Depending on what it is and when it strikes though, I might fail at suppressing it :/ it's definitely overwhelming at times though.

Generally, I'm a very "let the emotions flow" if I'm in a private setting and I actually find it cathartic in some ways. For me, venting to others and crying my myself is a good way to let out my feelings because I've noticed that bottling and blocking them out doesn't really... Mend very much? I mean, don't get me wrong, it helps hold things together but sometimes I feel like I'm hold a whole ocean back behind a very weak dam. And so choosing specifically when to let little bits out tend to ease the pressure off.

But yeah my entire school campus is a trigger ground for me and so each time I go outside it's like a mine field waiting to explode :/ I wear headphones and try to zone out as much as possible because if I do see something that causes my emotions to run haywire then it feels like there are fire alarms going off in my head and everything is going too fast and too slow and it's just an ugly feeling so I just try to avoid triggering it in the first place. Unfortunately it doesn't always work u_u