Why i always get hurt by someone.All their words got easily affected me.?

I am become unhappy.. if people are inconsederate.I got hurt easily when people saying a bad words towards me.bad comment even i know is not true.when i ask advice of my friend how to correct that types of behavior.They are always says ignore it.Its still hurting me.I cant take negative people and unpolite.people I got hurt so bad I wonder why they can easily those unkindly words to other people.I feel you have no right to say something to someone.or become snappy. and rude.I am wondering if this is really the real world people are so mean.I grow up in the farm i never feel people saying bad to me even when i was in high school and colleges.My teacher respect me all clmates my family.when i come over here in america.everything is changes.Its like i have culture shock!.I keep thinking about them over and over.what im going to do?