Is it normal i feel ashamed of the actions of other people?

You've gotta let go of this kind of guilt. Feeling guilty over what somebody else did doesn't help you or them and it's quite unhealthy.
Try understanding why people do such things rather than judging their deeds as bad. It should help alleviate some of the stress and give you peace of mind. When you start understanding the person, the deed usually softens.

I suppose it's normal if they are part of some group you belong to. Like your family, ethnicity or age group. So you assume others will think you are like them.

It's like if there's an argument between two groups and suddenly one from your side says something outrageous fully confident that the group is backing him. (As often seen and experienced on the internet)

To feel ashamed of the actions of other people IS stupid.

They're the one's who'll deal with the consequences not you.

You should study personalities and find out more about yourself and why you shoulder burdens of guilt that don't belong to you.

An uncomplicated book on personalities is called The Color Code by Hartman. It's been around for a while and it's an easy and interesting read with the test right in the book. Take it and have your friends and relatives take it if you can. Then you will learn why we all act like we do.

Its like you are Jesus!

Everyone is responsible for their own actions.

You didn't do it so it shouldn't really affect you.

You must be quite special.

Not normal, but you'll become a misanthrope like me in no time ;)

I don't feel ashamed of the stupid or violent actions of other people but rather I feel they're trashy people from whom I need to distance myself.

Slap yourself.

Yes it's normal. I'm consistently embarrassed at the disgustingly pathetic things people say and do.

Like when guys try to pick up girls over the internet, I actually blush for them because it's so fucking sad.