I feel that way about a lot of the mind-blowing imagery on here. Particularly those digital paintings someone does in three hours (spent that long reworking my headlights ).
Just keep at it, mate . The more you do, the easier it gets. That and paint shop really helps to adjust any mistakes. I rarely have anything beyond a basic sketch, often no more than a doodle, as a starting point these days, and usually very small on the paper (easier to start with something small).
Most of what I do is in paint shop now, especially for detailing. Practice and perseverance is all it takes . I feel I've improved a lot since I started drawing again, which I have to put down to frequency of work.
Oh I kinda know what you are taking about and I have noticed that all of your deviations are great and are improving and so are mine with practice Also I would like to eventually get a new computer and do similar pics to what you do Lastly thank you for all the kind things you've said to me I am gonna keep working until I become great