I get angry about things too often

[Snowdropsandbluebells]

I don't know how to help myself. People say I take things up wrong but I feel so hurt. Most of the time I don't react I just let it burn away inside.

I need help I think
I think I am realistic and sensible but I get let down again and again. Treated like a bit of a fool.

You've taken the first step which is to recognise that your old behaviour patterns aren't working for you, and you are willing to look into making a change.
CBT or counselling might help. Is your GP sympathetic? There is some help you can get on the NHS.
You could also look at assertiveness training, there are books you can get. There used to be courses but I haven't seen one for years.

Thanks so much. Years ago gp said I might have reactive depression but I didn't like taking anything. I've had a difficult upbringing (parents emotionally controlling and was up until I broke away and kept boundaries)
My brother recently let me down very badly.

Some difficult things are happening at work. People taking my ideas and passing them off as their own. I use stuff like that.

One of my triggers is injustice. So other people stealing ideas at work would annoy me (even if it wasn't my idea they were stealing).
The way I would deal with it would be to tackle it; work out how to protect my ideas, or how to ensure the right person got credit for them. Or in the worst case scenario, walk away to a new job where there was a better culture and I could feel my contribution was valued.

Who says you take things the wrong way - is it people who treat you badly?

So when my brother did something really hurtfull my mother defended him. Said I took things the wrong way.

It was the Care of their new baby for an few hours and then overnight. They rang several people and totally overlooked me despite being off work that day . They ended up asking my brothers ex who cheated on him. Rather than me.

I think my parents tell people I am mentally ill behind my back.

Hurtful

That does sound hurtful, I don't think you are over reacting to be upset by it.
Can you go low contact with your family while you go for counselling?

I'm on anti depressants for other symptoms but I'm definitely much lower on patience if I've missed any. I can get really angry without them.

Anger can be a symptom, if its new then definitely a good idea to see your GP/practice nurse for a check up if possible.

Perhaps you're not "taking things wrong at." It might be you have abusive, toxic people in your life who are gaslighting you.

*wrong at all.

Your family dynamics sounds very similar to mine. Going minimal/no contact with them helped my mental health enormously. Is that something you'd be in a position to try?