Feeling lost without my friends?

I've always been easily affected by my peers and only recently I've realised it. Whenever I'm around my friends, I feel like they're family, like they're the closest people I have. With them, I feel content and safe, like nothing could ever go wrong. But when we part our ways after a long day, I feel empty, like all the joy in my life has been taken along with my friends' departure. I feel lost, without a sense of direction, and then I feel as if I have no purpose in life. I know its extreme, but that's really how I feel when I am with and without my friends.

I'm not looking for a solution, just someone who can empathize with me...