Just to echo what everyone else is saying, eat more food! You can't get big AND stay lean, that's why we bulk then cut. Trust me, this is coming from a guy who had to eat TWO greasy footlong Subs for lunch today just to make sure he got his calories in. If you need to get hungrier, maybe try either Controlled Labs' Black Hole or USPlabs' Anabolic Pump. I can personally vouch for the Anabolic Pump. It FORCED me to eat complex carbs (or else it will make you start to feel hypo). If I had been better about my protein intake on my last run of it I imagine I would have pushed my weight gain on it a bit. It's also nice because it helps curtail fat gain to some extent when it comes to carbs.
If I remember correctly, some of the ingredients in Black Hole are supposed to act in your brain similarly to pot, so that you basically get the munchies. As long as you're aware of what you're eating, it could help you push your calories high enough to see some serious gains.
Also, as others have said, it might be time to review your workout regimen with your trainer. When I entered HS, I was already 6'2" and weighed about 5-10 lbs less than you, with about the same bodyfat. I trained RELIGIOUSLY because I became a football player sophomore year, ate a TON of food (my post-workout after saturday weights and cardio was a big shake with two scoops of icecream, two scoops of weigh, a ton of peanut butter, and a banana), and by the time I was a Senior my stat card read 220 lbs. I was higher bodyfat than I am now, but I was fast and I could move the weights.
All that to say, YOU CAN DO IT!