Advice: Do not will to delete your account, you might just come back later. Your work is okay in my opinion but you can always improve yourself. Every designer gets critics over his work but it doesn't mean that he should run away from it. You could rather improve your work and show people that you've got the talent than leaving the place out of fear because one place or another you will find people critisizing your work until you won't have a place to hide. So work it out and try to improve your designing until people stop saying that your artwork sucks. And start taking critisicm as a source of influence for you to work harder and better!
Bro, your work is no worse than 99% of peoples first few works. But in the grand scheme of things, your work will be sh!t for a while to come. You just have to push past it and stop being so whiny and impatient. You keep talking about a style despite the fact that most of your works are from tutorials. What you have isn't style, it's a lack of style. You haven't been at this long enough to know this, but newbs are constantly posting work that's exactly like yours is now. Nothing you're posting is original, nothing is new. Half of the advice you're rejecting is universal with all image editing software, so it doesn't matter what you're using. JUST SHUT THE F*CK UP OR LEAVE.
Okay then, GTFO the Internet you n00bz and yes you suck. Is that okay enough MP the man with the biggest penis?