In most of this world 20 year old females want MUCH older guys. Maybe not in America. That is due to America's hatred of men and the whole college thing. However, in most of this planet 20 year old females are very mature and living in an adult world (discos, fancy bars, etc.). Hell, in much of this world 16 year old girls are doing the same.
In conclusion, Sparky would agree with being who you are. Don't make a fool of yourself trying to be what you are not. I am sure you would be a stud in many parts of this planet. So just remember that and relax.