I've found that comparing myself to others never works out well for me. Is it that she has more partners than you or that you really wish that you had more partners? If it's the first then let it go. If it's the second then it sounds like you need to put yourself in the position to meet more people (especially since you are self-proclamed picky). You're not likely to make a connection with everyone you go out on a date with and there's no point in forcing something that isn't there. It just won't turn out well for anyone in the end!
Everything will be ok in the end. If it's not ok it's not the end.