Man weight or looks dont mean anything when two people are feeling good with eachother and have something to talk about. Its worth to do that jump and go for it. Cause life is short and you know good girls are taken fast. Its normal that you feel like not deserving her. Cause you see her as a god, yet you have to learn to love yourself at least as strong as you love her. Yes love cause you are in too deep at this point to not to feel love for this girl at some point.
You need google simplepockup forum and read there about how to get girls. Confidence will come only from experience. You can learn from other guys experience and try to dubligate it. Believe me even when you are perfect you still might be unable to make a move. So do ot now and you will be much further ahead than if you wait to loose weight. Theres never perfect moment, you just have to start somewhere. Follow your heart. Listening to what brains says is biggest mistake. Do what you feel, not what you think. Act on your fitst heart beat. You hesitate you masturbate. It helps a ton when you talk to girl right away. Now you hesitated and you like her too much, that makes it so much harder to do something. You wouldnt want girl to hesitate with you. So why are you doing this to girl?
Doubt kills more dreams than failure ever will