Can You Help Me?

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Right...Okay, I need help.

I'm 140 pounds and want to get down to around 110.

I would normally eat around 1500 calories, then I exercise and end up burning around 300 calories-ish, then I get worried that my body is going to go into starvation mode, so I eat more, and the food I've consumed is high, but my NET is low.

I lost a few pounds then the diet slipped and I piled it back on again in a day, so then I thought I was restricting myself too much and...agh.

I don't know if I'm doing the right thing...

Can you advise me on the best way to go about this?