What do you do about meeting new people who turn out to have a different belief system to you?

I feel threatened and unable to like people who do not think the same about things as me, sometimes i quite literally hate them and almost want to course them physical harm, but i never do, i just walk away and don't have anything to do with them, i seem to meet more people who do not agree with me as do agree with me, obviously this makes me feel very isolated and extremely guarded almost to the point where i don't want much to do with people, this leads to what i can only describe as a feeling of profound loneliness, i also find myself thinking of the state of the world and the people in it and it makes me hurt allot when i think about things, this hurt leads to anger and the anger to more pain, its a perpetual cycle, sometimes i can blot the world out, like now but then i ll hit a period where it all really starts effecting me and i starting thinking about not wanting to live even though i know i must and can't hurt myself, what's wrong with me and how can i get better, i m sick of dealing with this on my own but i find it hard to trust others with my feelings so i thought i d just anonymously say it all on here, can you help me?