Friends don't let friends pound gross diet pills. Stop THAT right now.
ALSO, when you don't eat, one of a few things can happen. Either, you're so effectively anorexic that your body eats your fat and you lose weight (yay!) and then wind up passing out walking down the street one day because your body doesn't have the nutrients to function (yay-- I mean.. wait, what?)... or, you don't eat, and then your body goes into "starvation mode." It thinks you don't have food available, so every time you DO eat, your body packs away as much crap as possible in the form of fat. It's very counter-productive.
Eating healthily can be tough, but you need to come up with a system that works for you.
I follow a simple calories-in-calories-out method, where I find foods that I love that are simply low in calories. It means I can give myself treats sometimes, so long as I work them into my calorie budget of 1,200-1,500 calories a day. Depending upon your height and weight, your own calorie budget may vary. (
This website can calculate how many calories you may want to aim for.)
If you decide to go the calorie route, which is a lot more feasible long-term than trying desperately to CUT certain things (Carbs) out of your diet, start by reading the nutritional labels of the food you're eating, and paying special attention to the number of calories you're taking in. See how many you eat in a single (normal) day.
The Daily Plate is a good place to look up how many calories are in the foods you eat that don't come with nutritional labels.
I know what you mean about the gym being packed with guys and it making you uncomfortable. I went to a gym called "Exclusively Women's" in my uni town... it made me feel SO much more comfortable using the weight room when there were no men power-lifting in the corner, staring at their muscles in the mirror.

Do you have much room at home? Maybe you could invest in a workout video? Jillian Michaels' 30 Day Shred is SWORN BY for a lot of the ladies here. Lately I've been going for evening runs around a high school track near by when no one's around.

Maybe there's somewhere like that around?
Even throwing on an mp3 player and going for a walk is better than NOTHING, so on days where I simply can't be bothered to change into workout clothes... I just take one of my doggies for a walk. It may not be the power workout of the century, but I'm burning calories, and that's what's important.
Stick around here, and check in with us regularly! It'll help ya stay motivated! Good luck honey!!!