Oh hello excuse me I'm sorry but is this the same joeygn72 who drew the Monica Belluci I practically slobbered over speaking?
I suggest you read biographies or check out youtube videos interviewing artists. I have come to discover a lot of them went and go through the same stuff the rest of us encounter. Like Kevin Eastman (I'm not a total geek about it, but I love comics) who along with Peter Laird created the Teenage Mutant Ninja Turtles. I marvel over his artwork and was encouraged to read that he struggles with every page....he compared it to war. I go a few days not drawing and I come back to it and suck big time for days to weeks and thought I have some problem until seeing J. Scott Campbell say even on vacations he draws because "you get rusty real quick..its like you forget how to draw or something". Because an artist I admire (Greg Capullo) mentioned it in an interview, I'm going through 'Drawing From The Right Side Of The Brain' after ignoring it for decades and you know what? Lessons that are suppose to take someone 45 min to an hour to do I complete in less than 10 min....which reinforces for me that I got the goods but I need to stay focused and not be lazy.
In physics, the secret to progress is traction. In a car various oils are used to lubricate parts to slow down wear and tear of stationary parts, but tires are literally where the rubber meets the road, and moving the car forward involves those wheels grabbing and pushing against something. Right now is a sweet time for you to grab at your desire to expand your porfolio and push against your tendency to compare yourself or your work to others and move forward into a renewed commitment to increasing productivity and performance. Every person of significance has faced a struggle, every individual of accomplishment has been tested by their own perceived limitations and emerged with a testimony for how they reached the other side and can attest to the fact that if they could do it, you can do it too.
Again, that's why I encourage reading biographies to assure yourself that you're not alone in any of your struggles as that feeling of isolation can be 10 x more powerful than the so-called obstacle itself...which may just really be an opportunity to grow wearing the disguise of a problem.