I'd rather be a comma than a full stop

You know what? Yes, I have changed.
I'm not as nice as I used to be, because I don't want to get used or walked over. 
I don't trust everyone and tell them my secrets, because behind every fake smile is a backstabbing bitch. 
I distance myself from people because in the end, they're only going to leave. 
I have changed because I have realized I'm the only person I can depend on.

Your words aren't strong enough to fix what happened here.