If your main fitness goal is to lose weight, exercises that get your blood pumping are more effective than lifting weights. Weight training certainly has many benefits, but cardiovascular exercises are the most effective choice for burning fat. Try raising your respiration and heart rate to build muscle mass when losing weight.
Surrounding yourself with health-driven, active people is a great way to inspire yourself. When we are around those who are active, we tend to be more active. Someone who just sits around all the time might not be someone who you want to hang out with.