Just my interpretation...
'I've been running in your direction for too long now
I've lost my own reflection
and I can't look down if you're not there to catch me when I fall'
You are close to a friend/gf/bf/etcand have become reliant on them, you do know want to do anything without them, they give you confidence, and do not want to try something new if they will not be there to help you (catch you if/when you fall)
Just my interpretation... 'I've been running in your direction for too long now I've lost my own reflection and I can't look down if you're not there to catch me when I fall'
You are close to a friend/gf/bf/etcand have become reliant on them, you do know want to do anything without them, they give you confidence, and do not want to try something new if they will not be there to help you (catch you if/when you fall)
Just a thought