Do I suck or do I REALLY suck?

Einzelganger7: I am "Cognizant-Incompetent" with no doubt, I am aware that I commit mistakes and I try to improve but I feel incompetent because I am not skilled in all classes, TDs I do well, medium and heavy not bad but I suck at light tanks and this is why I feel incompetent, because it seems like it is the meta class nowadays (along fast mediums) but I can't get the hang of them that I am even stuck on the very first StuG IV campaign since I started playing, I got quite fast with honors the TD, medium, and Heavy missions by casually playing but I am still at something like 11/15 with lights, but I haven't tried using them since more than a year ago, so maybe I'd be a Cognizant-Apathetic instead, and I feel apathy for using light tanks and completing campaigns mostly because none of the reward tanks interest me at all.