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Just keep at it. No-one woke up and just knew colour theory or how to draw - many, many, many, many hours were spent grinding those skills and knowledge. Sometimes you can't tell how far you've come, either.

Try something like this:
Each month draw the same picture. Keep these images in a folder and don't look at the old ones until a year is up. Then look at the first one you drew and the last one and that will show you how far you've come.

People learn at different paces and they also have different ways of learning. If reading tutorials isn't working for you, you might do better by either watching videos and picking them apart piece by piece (on youtube there's a neat speed function on videos where you can speed up or slow down. that might be handy to know)

You might be a do-er, someone who just needs to do something 200 times before you get it. Some parts might come naturally, others might take longer than you'd expect. People learn different things at different times and speeds.

And real artists are NEVER happy with their work - they might think a certain piece isn't completely bad and share it with the world, but a lot of the time they're always judging their pieces and finding them wanting. You're never going to reach a point where you're suddenly happy with your work because there's always going to be someone better at it than you. Use that to push yourself beyond your limitations.

Basically: Quit whining, keep grinding. You'll level up eventually.

Also, some areas simply are a lil trickier for us than other areas. The solution still is the same - practice!
Copy photos, analyze art, sit outside n draw. Eventually you'll get better n better.

You're probably better than a lot of people if that makes you feel better. I have a hard time doing this kind of stuff so you're already a step above other developers who don't have any idea what they are doing! :P

Everyone struggles at first, but if it's something you really want to do then keep at it! A lot of awesome artists here can help you along the way :)

author=Sooz
Spoiler: Your work will look wrong like 90% of the time, because you're always going to be not quite as good as you want. This is the life of an artist.

^This.

Also, this is a difficult, subjective medium you are working with, so don't expect things to be easy, especially when starting out.

gumby's post is a good thing to look at, though.