Rather than feeling like you can never indulge or be social, be mindful of your choices. Pay attention to how much food you put onto your plate. You likely already know which foods you can load up on (think green veggies) and others that require more moderate portions and self-restraint (like the guacamole and tortilla chips).
Be mindful of portion size but think mostly in terms of quality, not calories. An energy-equivalent portion of kale and processed fast foods are not equivalent in any other way, as the cruciferous kale is akin to a warehouse of nutrition with anti-inflammatory, anti-oxidative and anti-carcinogenic health benefits.
For as long as I can remember, I've been told that it's paramount to load up on carbs before any kind of physical activity. As I've gotten older, wiser and tried things for myself, I've realized that this is complete overkill. In most cases, eating carbs before working out is like filling up a near-full gas tank and watching excess gas spill all over the ground.