I can’t tell you for sure how to make your life comfortable.
However, I can tell you how to make your remaining 34 years uncomfortable. Eat a lot, gain weight, and don’t exercise. Waking up every day with bad knees, hips and joints is a sure way to start your day miserable.
If you want to avoid that fate, control the two biggest factors that are totally within your control: eat right, and get some exercise. Get your weight down to a healthy BMI level.
Start today. It will never be easier.