Wedding in September

I'm a 26 year old female getting married in September and would like to slim down and tone up! I'm looking for female friends to stay motivated with. I'd like to lose 15-20 lbs altogether.

I've found that logging my meals in here really works, but have only ever kept it up for weeks at a time. Most recently, I was losing 1lb/ week for about 4 weeks, and then gave up during a snowstorm (cold + snowed in = grilled cheese and pancakes!) 4 weeks later, I've gained the weight back... I would really like to get back on track!