If I was you I would wait another couple years say around 20 or 21, I would continue to focus on proper diet and get your training down more. You have a chance to get alot more gains naturally at your age. If you juice now you will just get to your natural limit faster. The key is to get to your natural peak first then use aas to take you over the hump.
When you are ready I would recommend adding test to that cycle of dbols at about 250 to 500mg a week for about 10-12 weeks,
1-4 dbol 35 -45mg a day
1-12 test 250-500mg a week