It doesn't matter whether or not you join a Fraternity in regards to pickup. That's all up to you. You can make things work with your pickups without joining a Fraternity or you can take advantage of the social benefits that being in a Fraternity gives you. You can make anything work; it's all just a matter of your personal style.
Don't listen to anyone when they say "Don't fucking do this or that blah blah blah" when they are obviously emotional about it and haven't tried it themselves firsthand. Biased anecdotal accounts will not serve you. That's just a tidbit of wisdom that everyone needs.
I'm 18 and I get into the bars I want (not ANY bar, though). Have you even tried? Or is New Orleans just really awesome?

If you join a Fraternity with bouncers in it, you'll be able to get into those bars where they work at.
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To be honest, my social circle is pretty small in my sophomore year so it's hard to be introduced through people.
It's never too late to expand your social circle if you've got the right attitude.
Check out Mark Redman's blog at
http://www.thetruthaboutcollegegame.com