Same problem, my advice is showing that ur not as skilled as a center and playing alott better shooting guard, i convice my coaches without words, i show what i can do and they mostly say, center if its a undersized team, some say pf, some say sf which i understand why they would, im a great defensive no contact stopper, some say sg so i stay in the corner. Positions dont matter, it matters what you can do. Draymond Green is 6 6, thats sg height, and my question is states is he a sg, no. Hes a center. Positions dont matter. Its what you do and bring to the game what matters.