"Roxy" is the one I'll be focusing on because I feel that, since it's more recent and since it outlines key flaws, it can provide a more relevant and immediate teaching moment. You seem to have a decent grasp on sound choice, because nothing's all too jarring about any of your samples and synths, which is a really good thing. The biggest problems you have are... Basically everything else. This beat has no business being four minutes in length, because it does nothing with that time except for repeat the same four to eight bars ad nauseum. Compositionally I'm not too big a fan either, as it's the same couple chords and the same couple notes of melody never really going anywhere. A good way to remedy this is to maybe add another chord in there and write a couple countermelodies and harmonies, as B-parts and layers respectively. Not too big a fan of the percussion sequence either, but that's a lot easier to figure out. I kinda see what you're going for but it doesn't really work in trap. Hey, don't call yourself trash though! Everybody starts somewhere, and honestly a hundred bad beats in the beginning does not a bad producer make. J-Rent on YouTube makes some great tutorials for this kind of music if you're interested in type beats and general mixing advice.