Rapha,
You still have the potential to "grow some more" at this stage.
I recommend you be patient and allow nature to take its course so to speak (for now).
Most guys typically finish growing by say age 17 or 18...some even a bit later on.
So, there's still time for you to see what happens.
As to jelq techniques, there are numerous threads around here--particularly in the "making it bigger" section where several of us (who are older!) share our experiences. Jelq improves girth (typically) more than just length. Jelq is also good for maintaining good circulation and overall health of the penis tissue. I would NEVER recommend jelq for solely enlargement purposes only...never. So, don't get your hopes up!
If after a few more years you want to practice jelq--concentrate on it then. Right now,while jelq may not prove counter-productive to you while still growing, it's not really going to change the course of where you're heading in size naturally during this period of your life.
Why expend that effort just now?
So, just "hang in there" (literally and figuratively) for the time being.