Yeh dude I've got osgood schlatters aswell
There's loads of things you can do to make them better. Stretching the quad muscles everyday at least twice a day and stretching the hamstrings is also very important.
You need to ice them 2 or 3 times a day for 20 mins. If they get really sore take 1 or 2 days off and do absolutely nothing.
Also cycling helps them and is also great for fitness. Swimming is also great for fitness and doesn't do your schlatters any harm. Do not do any extra running outwith when your playing football.
Youre 16 right? And you've just been diagnosed with them? Usually they are diagnosed at about 10-12.
The pain stops when you've stopped growing (ie. once the muscle growth has matched the bone growth)
The only pro footballer I know of that has suffered from osgood schlatters is Bobby Zamora at West Ham but I'm sure there are many more players who have had it.
Oh , also try to avoid playing on astroturf at any cost because it is the worst surface to play on , not just if you've got schlatters but for your ankles , knees and hips in general.
What sort of a training schedule do you have ie. how many trainings , games , individual practices etc.?
Hope this helps.