You mentioned the gym which is a great thing, but what about your food plan? *They* say that weight loss/management is 80% food/20% exercise. So I urge you to really, really, REALLY focus on that aspect of the equation. Give that a lot of thought and effort.
As far as motivation, well motivation is fine and dandy and can get one started - but I urge you to not rely on it. It doesn't last very long, as I think you've discovered. It never seems to be around when the beer, pizza, pasta and ice cream is and when it's time to get moving.
Therefore I urge you to make a COMMITMENT. An iron clad commitment to *do this* no matter what - NO MATTER WHAT. Without that iron clad commitment it will be next to impossible to get the job done. That commitment is what helps you make the right choices day in and day out. That commitment is what gets you to pass up on *those* foods and choose the *right* foods. That commitment is what will get your tail to the gym or to take a walk instead of slacking off. It's that commitment that give you that stick-to-it-ness - regardless of whether you feel like it or not at the moment. And THAT'S what's needed.
I would also not worry about the numbers. FOCUS on the behaviors. Change those behaviors and the weight will come off - each and every excess pound that you've got. Work on making permanent life time changes. Continue on with a healthy lifestyle, create that calorie deficit and there's no way that the pounds can't come off of you. Continue on. No stopping. Making that commitment to be a trim, slim, healthy, all that you can be person - and you then will find/acquire the tools and skills to get it done. Losing weight and lots of it IS a doable thing. Make no mistake about it. You have the ability to do this. You don't have to be fat if you don't want to be. You do hold the power. You've got the control over this. You hold the key. You absolutely CAN do this - and you should.
DECIDE to do this, commit to do this - formulate a plan, a mode of attack, get excited, get moving, get planning, get, get, get - and transform your life. Stop settling for second best when first is well within your reach.
I commend you for wanting to and dealing with this at a young age. Oh how I wish I would have. Living in a fit, trim, healthy, toned body is better than I ever expected. This is nothing to dread by the way, once you get into it, you GET INTO IT. It takes on a life of it's own and is worth every single bit of effort you put into it - by tons. It is worth it on so many fronts. The added energy, stamina, productivity, self respect, self worth, self confidence, better skin, more clothing choices, feeling fabulous, the compliments, and on and on and on.
Challenge yourself. Push yourself. Master something new! Learn. Prosper. Grow. Discover who you were meant to be. You won't regret it - not for a teeny tiny second.
