I told my girlfriend if she's too uncomfortable with us being together then we can stay just friends. She said I'll consider it. Meaning?

Meaning that she will consider it. Give the woman some time to think things through.

I know it feels like eternity when you have to wait for an answer like that, but all it means is she needs some space and time to make her decision. But be there for her if she needs you. :)

Meaning, you are too young too play these games.

Either you commit, or you leave yourself a way out playing the "Safety Net Friend Card" means you are not really in this for a relationship, and either she was too hurt to admit or she has been contemplating the same thing.

Learn to communicate effectively . . . If you want a long term relationship, treat it like one . . . If you don't be up front about what you are looking for.