One of two thing will probably happen for you.
1. You'll all of a sudden just start putting on weight in the next few years..
2. You'll have to weight until your late 20's or even early 30's for your metabolism to slow down. Once it slows you will finally start to put on some weight. I'm 27 and I've recently started to see signs of this happening.
Make sure you keep training, eating(never let yourself feel hungry) and sleeping. If you are only making strength gains at the moment that isn't a bad thing. Getting stronger is good! There are a lot of "little" guys out there that have no problems putting a big guy in his place.
The other thing to realise is that not everyone has awesome genetics. Some people just seem to look at weights and they start growing. Others have to train hard for many years to get the same results.
Above all, be patient. Your young and your body is still growing.
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