Keeping a healthy body weight doesn't have to mean visiting a gym and being on a permanent diet. In fact being on the wrong type of diet can be a bad thing in the long term.
Try to find a sensible balance by eating a variety of different healthy foods and taking small amounts of exercise everyday. If you are obese, then start with a short easy exercise and very gradually it build up. a 10 minute walk, a 15 minute walk, a 30 minute fast walk, etc.
Try to find a type of exercise that you like (or at least don't hate), the most important thing is to STICK to it. It's a lifestyle change, not something you do for a few weeks then give up.
You might not care about how you look, but you should care about your blood pressure. So if you are overweight, do yourself a favor and see your doctor to have your blood pressure checked.
To check if you're obese please visit these pages.
www.cdc.gov/obesity/defining - defines obesity.
www.cdc.gov/english_bmi_calculator - this pages lets you calculate your Body Mass Index
Low Sodium DASH Diet
A diet recommended by the US govenment, to lower blood pressure.
Salt and Blood Pressure
Too much salt in and on your food is a bad thing.
Tomatoes and Blood Pressure
Tomatoes are effective at lowering blood pressure because they contain lycopene.
Blood Pressure Monitors
Do you need to monitor your blood pressure?