Welcome frieswiththat! I too have 70+ pounds to lose and I'm taking a similar approach of first eating right and then gradually adding in activity. In regards to your peer pressure eating, have you tried eating before you go out with friends? If you're already full you might be less inclined to eat with the rest of them. Also, if you do end up cheating on your diet, try not to beat yourself up and realize that dieting is a one day at a time process and the potential damage to your selfesteem is not worth it. Just keep your head up, and move forward.
Good luck on your journey