I'm afraid and too lazy to work out
What are you afraid of?
I can't handle pain and discomfort
Starting an exercise program can be hard. But exercise is important for health. If you find a physical activity or sport you really like, it may not cause pain.
I've tried running but it's exhausting and I want to stay at home for days after.
Running is not for you, but you can exercise by walking or light lifting.  Even playing a sport that you enjoy can be a good workout.