I hope it goes well tomorrow 
I am trying to think if I've ever been in a relationship where I haven't done the asking, or a least given them a perfect opportunity to ask me out. I used to go out with friends every so often when I had some and they were gorgeous girls, and I - well I was always the confident, funny, bubbly least physically attractive one. I could hold a decent conversation and was approachable - I have never failed to 'pull'
So, I wouldn't worry about your size. Being magazine style perfect is really attractive for all 10 minutes but if there's nothing else there then the interest soon fades. I think someone's personality can make a huge difference to their attractiveness. A beautiful looking person with a nasty personality soon becomes ugly and an average looking person with a good heart can be the most beautiful person in the world to you.
Disclaimer:
I have not been out 'on the pull' for a very long time and don't think I have quite the same confidence levels that I used too. Plus, I am to old now to even entertain the thought of chatting to a drunken sleaze looking to get into my knickers. I am going to stay a man free zone.