Smaller one car garages are usually just used as sheds for lawn care equipment, maybe storage of outdoor furniture when it's out of season. If you can't fit your car in it and if you don't want to tear it down and start over, you should just paint it and let the next people who own your house worry about it. Is the siding rotting?

Use some of the rock edging treatment for the garage area like the rest of the property to tie it in. Clean up the dumped gravel/sand and firewood, etc.

Then paint the shed blue with white trim and yellow window boxes. Plant sunflowers and Shasta daisies along the walls. Nice studio or potting shed look.