Hi mate, firstly as someone like yourself whos almost 20 and wanting a full beard I know exactly how you feel! You have made some good progress and I can see a good few hairs that seem to have come in slightly later on which is great news. Second, don't let the cheeks bother you, if you let what you have now grow for a few months you will find the rest will fill in and as for the cheeks you will simply have a slightly lower cut look beard until that fills in too! Good luck and keep growing! I will be keen to see your progress