That reason I am angry so often is because I have anxiety.
Now this may be because I am oldish. But I grew up in world where anxiety and depression. all those things luckily existed but where associated with sadness or apathy.
So a lot of situations where I got anxiety, for example to be late or risk of asking stupid question I became really angry.
Making it extremely hard for people to deal with me because of the association was not something that was naturally occurring for people.
So last year I found an article about it and it honestly changed my life. I still get angry but now I can actually try healthy coping mechanisms instead of fighting anything.
Do you by chance have a link to the article? I relate to your comment a lot so I might be in a similar situation