Right with this question I can see a lot of self-hatred and shame in you. It looks like you have been around of people who have invalidated your emotions. It's not about the little things that bother you, it's about the pain inside you. Little things can trigger huge amounts of pain. Because it's not dealing with the thing, it's dealing with the inside of you.
This could be due to a number of things. Try looking at how youre feeling in general. Are you stressed, tired, under-eating, under pressure/not processing frustrating emotions? all these factors could explain why one may not be able to control anger as easily as before
I suspect it's because you've got others things going on in your mind, stress, sadness, loneliness, misery, things you haven't gotten out in therapy or told your friends or family or partner... it's been bottled up so when small things happen, it's like the straw that broke the camel's back... so when you get angry, you don't get angry at the small stuff exactly, you get angry because of all these other things that've been going on inside of you for weeks, months, year(s), depression, anxiety, or something else that you're battling which can lead you to feel hurt and angry.
If you are having problems with anger, perhaps you should speak with a trusted healthcare provider, therapist or counselor to help you sort your feelings. There is also support groups you could seek for anger management. Try looking into your local resources for more information.
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