Love is a verb, a choice. We obtain it by loving others, a choice. It feels good. It rules a man's life and makes him pleasing to God. It will look different in different people's lives because of different situations, but the underlying idea is the same (good will). We can only relate to being loving by actually being loving. If we refuse to love (by selfishness) then we risk our minds becoming darkened and forgetful. Immaturity means mistakes not willful rebellion. God requires that we love him with all of our heart, soul, mind, strength - not with with more than all of these. His commands are perfectly suited to our ability - no more, no less.
The fact that God commands love is proof that we are able to love.
The fact that we are able to love is proof that we are able to know whether we are loving or not.
It is good, and most simple, to love ourselves. When we love ourselves, we consider what would be best for ourselves (most pleasing in the long run) and then choose accordingly.
Likewise, when we love others, we must not be solely occupied by considering ourselves, our own thoughts, feelings, etc. We must occupy our minds with considering what would be best for the other person, what would be most pleasing to them in the long run.
The same for loving God. We must consider what would please God the most and how important his happiness is.
Love requires us to be honest with ourselves about our actions and motives. But love also requires us to take our focus off of ourselves and put it on to the value of the greatest possible happiness of God and others.
In baseball I might take some time to look at the bat and select a bat to hit the ball with. But when I am swinging the bat to hit the ball, I am not watching the swinging bat, I have my eyes on the ball. Both are necessary. A broken bat won't work, and forgetting to keep my eyes on the ball won't work either.