I would start with playing point guard. Once you start playing more, you'll see what skills you have. Try playing al of the position and see which one is most comfortable.
Somehow you did not mentioned how good is your dribble, shooting n rebounding.... did u have a data for you to refer? but to be honest good shooter... are you sharp and consistant enough? good rebounder.... can you grab 15 rebound in 1st half? good dribbler... how fast u can be from baseline to baseline with dribble?? These are just some idea to let you know that where your standard be.... From these tests/analysis you will know where to go~
Just some ideas~ no hard feelin bro~ n good luck in you game~