Hi there.
I totally understand and boy do people make me angry!!! I too am a nice person and I don't like the fact this agitation is in me, but people really do make me crazy mad. All I see are selfish, greedy and damn right jerks all around me! I must add, I am HIGHLY sensitive so it doesn't take a lot to upset me.
I used to just get upset by people and people used to make me feel uncomfortable but now all those feelings have turned into anger. I am angry at ppl for making me feel this way which is total bull crap as I know it's me I should be angry with! I am finding it hard to take responsibility!
I am a nice person, I am a good person but I have a severe issue with my anger and agitation towards others. I treat people with a lot of respect and sensitivity...problem is, that leaves my standards for others behaviour towards me very high,....maybe even unrealistic.
So I totally understand and I am trying to work on it but without being in therapy, I feel it's an impossible task. I am on a damn waiting list and it seems to be taking forever!
So no, you are not alone and I hope we both find way to manage the negative feelings as the only people they truly hurt, are us.