Losing weight and being reasonably fit is 90% mental.
If you make up your mind and decide that you're going to have a good, healthy attitude and a full life, no matter what, your body will shape up accordingly. It's that simple.
Your body is a reflection of your emotional, mental, and spiritual shape. If you're unhappy, depressed, deflated, and blue then your body will reflect it by being sickly, overweight, and tired. Likewise, if you decide that you're going to do what it takes to feel good, enjoy your life, find peace and fulfillment, then your body will show it.
Let a healthy attitude reign. Decide and commit to the idea that nothing's going to get you down, and you're not giving up. Go out and live. Expend your great God-given energy and do something. Be the keeper of your mental outlook and take charge.