new outlook on things

i have always been the kind of person that likes to help everyone solve there problems. even if they stab me in the back later on but just recently I'm feed up with everyone stabbing me in the back and acting like they don't care.. Or they only use me for a ear so they can vent.. Someone was talking to me a week ago and told me that i need to help people just not let them bring me down that i need to defend myself and stand up for what i believe in... before i would just say that I'm fine with it and let them walk all over me... but not anymore I'm am not going to let anyone stab me in the back.. i will listen to them but I'm not going to let them bring me down