I have this problem..........?

Ok, So I am scared that i will/can die in situations which is a daily interference with my life...Sometimes, when i go to sleep i think about people breaking in, killing, etc. It prevents me from doing some of the things i want to do such as ride rollercoasters, activitys, and other things and it really bugs me....Is there a specific reason i think like this? Any way of coping with the anxiety of what i envision? Thank you.....