[Doku]

Ok,
As a guy, married to a woman who was, as she puts it, "not the pick of the litter", and a guy who has had more than his fair share of women, here's my take:

A) The assumption is that you are looking for "the one".

1) Step out of your shell.
In my experience, the reason that most of the women who strike out do so is this: They got shot down in the past, and aren't ACTUALLY trying. They will claim to be trying, looking, etc. But the truth of the matter is that they say, "hi", and don't immediately get asked out on a date, and call that trying. The ones that are successful will carry on a full conversation. "Hi. Class sucked today, didn't it?" "Oh, you liked the class? really??" "Oh, what makes you say that?" "Ahhh. you could relate to it because you grew up on a farm. Where?" "Well, I'm from Georgia, but my family used to visit NY a lot. It seems quite nice there. Don't you get sick of the snow?" Keep going. As long as you seem interested in a guy, most will gladly talk about their history, experiences, hobbies, desires, etc. "Oh, you like pit beef? I love the stuff! There's an amazing place just down the road. Have you ever been there?" "No? Well, it's almost dinner time. Care to take a walk?"
If you keep them talking, you can either find some common ground, or find that you have no interest in persuing it any farther.

2) Dress the part. If you don't want to be treated like a little girl, don't dress like one, don't twirl your hair, or smack your gum, or constantly say 'like', or any of the other annoying things that little girls tend to do. Dress the part, act the part, and you will VERY quickly become the part. (and, by the way, 30 layers of make-up = kid, not adult)

3) Apart from the clothes and some speech patterns, do NOT change. There is nothing worse than getting 3-6-12 months down the road, and saying "Man, you've changed since we met!" because you have not changed, just merely grew comfortable with the situation, and reverted back to who you truely are... and then you have 6+ months invested in a relationship that was based on, essentially, lies, and it falls apart. Trust me, you'd prefer to be single and never had that six month experience.

B) You just want to get laid.

1) Dress like an adult.
2) Since you are observing the behavior of college kids (bad examples, by the way), I am going to assume that you are in college.
2a) Slightly "off the norm" either a bit short, a bit overweight, a bit tall, stick figure, etc.
Sit in the lounge of your dorm around about 10pm. Pick a guy coming in, preferably with one or two friends. Approach him, say that you're bored and would like him to stop by. Tell him your room number, and go back to your room. Wait about 10 minutes. Should work 75+% of the time.
2b) Much "off the norm". Same as above, but pick a single guy.
2c) If you're a bit of a freak, approach the group and tell the group that you're bored, and want them to stop by.

Disclaimer: While I do not endorse "type B", I understand it, and am simply providing you the information. OH! And whatever you do, BE SOBER. Do NOT get drunk/high/... Nothing good ever comes of those situations.