Welcome to the board. Not having a lot of facial hair at your age is normal, most guys don't have much but make great progress during their life. You could try to let everything grow for few weeks more, if your sideburns catch up a bit you could try to grow chinstrap but don't expect it to be very dense, maybe goatee as well. Give it a try. You can search on board and you'll find some great examples how guys can go from almost nothing to long bushy beards in a relatively short time. Don't lose hope because beards develop during your while life. For more information, please check Rules of Beard Acquisition in my signature and if you have any more concerns and questions please ask.
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