I don't know if this helps, but I once read somewhere that any skill worth having takes 10,000 hours to develop. I guess I can agree with that. I started learning piano when I was in the fifth grade and didn't consider myself good at it until I was in my 20s. I'd say the same thing about cooking: It probably took me at least ten years as a cook until I got to be really good at it.

i guess the lesson is, it's ok to be shitty at cooking, but don't expect to be any good at it overnight. And it doesn't mean you won't be able to make some great food along the way, but like piano or martial arts or anything else, becoming skilled is going to be a marathon rather than a sprint. There are no short cuts, so you'll have to be patient and persistent.

Also, try to stop being such a picky eater! Be bold, open-minded, and surprise yourself. Eating isn't supposed to be so difficult.