Help Need to Shut Down My Emotions, Don't Know How

[Seered Doom]

I need to know how to numb myself on a conscious level because I know it happens sometimes without me thinking about it, but I don't know how to make it happen all on my own. I wish I can just press them down all the time, that's my ideal, but it's not working in my favour and I keep being taken as an ahole, even if it's unintentional. What do I do?