I am losing weight so slowly..what am I doing wrong?

I am currently 135.8lbs, I started off the week (last Friday) at 137lbs. I know that's not that bad but I've been working out like crazy, burning 500 calories on the elliptical every day and then doing toning exercises. I have been eating pretty healthy, trying to stay around 1,100 calories per day. I drink water, I don't drink soda. I only eat lean meats. I got on the scales a few days ago and it said that I weighed 135.4lbs...and I was so happy because I thought if I stuck to my diet I could be 135lbs by today...but I gained weight.

Any suggestions? Help? I want to be 125lbs but I feel like the weight is coming off so slowly
Updates
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I'm 5'7 in case people wanted to know


I am losing weight so slowly..what am I doing wrong?
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