Friends and fake friends

Earlier, I used to trust people like anything. Every person I met, I thought my friend. Then I started going to college to study. For almost 2 years, my life was like a living hell. There I realised people use you, throw you, play with your emotions, are nice to you only when they have something to gain, and otherwise they don't even care about you. They were all hurtful and left me broken. But among all these people I found some good friends too. I must say they came forward to be friends with me, stood by my side, always supported me and I'm thankful to them.
People treat you like shit when they find that person in front is nice or helpful or trust people easily, and they just start talking to you on purpose.
I'm thankful to all fake people for treating me like this because I've learned a lot through my experiences with them which I think were important, making me emotionally stronger and helping me live my life much better than I did before.
My 5 years before graduation have changed me. I'm still friendly, helpful and caring but now I don't trust people easily. But I'm always going to be optimistic no matter what.
I've only few friends in my life, but I love them and they love me too.