[HELP] I have to start this healthy/fit lifestyle NOW before its too late.

I just need some help motivating myself. I find it so hard to eat the right things. I live with my girlfriend who is unmotivated to change the way we eat. So when it comes to it, we always have horrible food of which to eat in the house. I did p90x for 2 months and it was the best 2 months of my life, i was loving it. I found myself one day unable to eat anything healthy and because of that, i stopped. I have gained at least 40 pounds since then, 40lbs of that has to be pure fat. I'm 5'11'' and for the love of god I need to do this. I'm trying to use the website Loseit.com for tracking but I really don't think its something i can stick to, i'm too busy for things like this. I ate a medium sized pizza all to myself today because there's nothing constructive or what my mind deems "healthy" in my apartment. I'm in a financial rut so its hard to buy Good food.

Hell honestly my sex drive is even down. I get tired having sex. Its pathetic. If anyone can help motivate me please do. If you have any tips to help me, please do. I'm desperate right now.

I really just need someone to tell me to get up off my ass and change it.