To Trust Or Not To Trust?

It's hard to trust people nowadays. Who can I trust? Who can I not trust?
If only everyone had a sign on them saying, "Trustworthy" or "Untrustworthy"? It would make the whole world a lot easier! I wonder what my sign would say? Trustworthy, I hope! I always keep promises. Well, I try. But what if the person you can't trust is someone close to you? Someone who you rely on? Someone you want to trust?! If that person just abuses your trust and uses you! Then you feel all worthless and used! Was your friendship even worth anything to that person? The whole time, you've been unaware of their plans! They were just using you, you were nothing to them. But, what if that person is genuinely sorry? Do you forgive them after what they've done to you? Will they just use you again...?
Life is confusing. That's a fact. I just hope I know who to trust and who to not trust soon! Because my life's getting a bit weird at the moment! I'm only a teenage girl! I can only cope with so much!
Bye xxxxx