Trust People

i always get rid of friends at some point. i always start to think and concern a lot when i find out more about that friend. i really want to trust people i met
so i can get close to them, however, my past experience is when i got closer to new friend, i found some behaviors or background of this person made me uneasy, i felt like he may do some bad things to me and i would not know how to handle it
probably i need to believe i can handle whatever come to me first (having more confident and a stronger mind) before building a relationship.