I have enjoyed the previous postings in this thread. In addition, you may be touched in your soul by something I read which I truly believe in. That is:
You are (or will evolve into) the lives of the individuals you spend the most time with. Since you're unhappy because you may have low energy levels, be slightly overweight or be unsatisfied with your attitude or life choices, I would invite you to reflect on the five people you spend the most time with. What do they do? How do they think? Do you aspire to be like them? Consider their eating & drinking habits, lifestyles, financial situation, spirituality, goals (or lack of them), their personalities, perceptions, mindsets and other activities. If you'd like, make a chart with columns. Consider your compatibility. Where you detect many incompatibilities, this is a sign to start spending more time with people who motivate and inspire you to stretch yourself. Steve makes a great point about limiting time with negative people. After all, they would drag you down not help you get ahead.