Would you say I'm a "cold" person?

It sounds to me that something/someone hurt you deeply and in your fear to not have to go through that again, you just avoid any type of deep or meaningful relationship with anyone/anything. It is a nice way to live if you don't ever want to trust in people again. Especially for someone your age, you have so much ahead of you, I would try to open up a little and realize that not everybody is mean spirited. Do not live in fear!