Procastinating.. Is it because I’m autistic or lazy?

I procrastinate about everything. Why do I do this?

- At work it takes me around 3 hours to actually do something. I distract myself with anything but work.

- I struggle to do simple tasks like post a letter. 

- I’ve had a box of rubbish in the boot of my car for almost 2 years now.

Any tips?

Writing lists sometimes helps, sometimes doesn’t. Read lots of books and researched loads but not been useful.

Is this an autistic trait or does it happen to many people?