Why Am I Always Angry?

Perhaps you've just gotten used to reacting like that since you hit adolescence?

I know it might sound weird right... but hear me out.
I have a tendency to snap at people too and at the time it feels totally justified.

When we hit our teens we feel like we know it all and if someone questions us it's like a challenge to our wisdom. A lot of teens will answer in a defensive manner automatically.
Usually this is a phase that we get over naturally.
However, if no one knocks you off your perch or you don't notice your reactions pushing people away, then there's no incentive to mature past this point.

You'll probably be able to identify dozens of times where you responded to someone or something and regretted it because you hurt someone or bullied them into being quiet or put those around you generally on edge.
If someone treated you as you treat other people you'd probably want to go through them for a short cut!

Try to give people the benefit of the doubt in the future.
If someone boils your blood, pause and rephrase what you would have normally blurted out so you don't seem as agressive.
It'll take years off you.
If you use more neutral language and don't focus on the things that p1ss you off, you'll be happier in general.
It's so easy to get yourself in a bad mood and take it out on others.
Trying a few weeks thinking about what you say and how you react before you plough ahead might turn things around.

Best of luck.