You're already on the right track if you are noticing the herd mentality "getting the girls" etc. It's very difficult to keep true to yourself but you can do it. Always keep focused on the reason you are there; your "job" is to get an education. Next focus is on a few good friends, popular or not doesn't matter. The scary part is something we all deal with so be kind to those around you remembering they are as scared as you!