Is there a sure way for anyone to lose weight?

I mean - jesus freakin christ I've tried EVERYTHING. I started eating spaced out healthy small meals as part of a metabolism enhancer diet, I've tried dietary supplement pills, I aerobic dance for any hour a day, and i horseride for 2 hours a day. Not to mention I hike a lot i never drink sodas!! And yet I still feel like I'm not thin, what am I doing wrong?