Having long ears.
A missing tooth
Shortness
Boldness
Overweight
A birth mark
...
Anything physical that you consider a disadvantage. There is a great way to exploit your insecurities. It's to show them. I'm serious about it. For example, a girl would notice that you have a fat tummy, so she would start testing you and telling you how much she loves guys with a six pack.
You can either be ashamed of your belly, and let her make fun of you, or be daring and bold about it and attract her even more. You can say something like this:
"You like guys with six pack, that's so cute, here, look at my six pack (and show her your belly), go ahead I know you are dying to touch and feel them."
Make fun of her and tell her that you love your "pudding belly." Believe me, a girl would like a guy to treat her that way than hiding his insecurities.
· The second fatal mistake you will do when dating girls is bore her.
If you bore a girl, you are heading to disaster. What are girls looking for in guys? Confidence and FUN. There are no girls in this universe that don't like a fun guy. If you are a fun guy, then you won't find any issues attracting and dating girls. On the other hand, if you are a boring person, you should definitely look for ways to stop being so and become fun with girls.