i was in the same boat you were two seasons ago- i was a 6'3" 220 OLB coming out of high school- i am fast as hell (4.4-4.5 range), but i was about 15-20 lbs. lighter than the other scholarship linebackers. the coaches actually wanted me to move to safety, and i did for a while, but i have played linebacker since i was a freshman in high school, and i fuckin' love it. safety is fun b/c you really get to hit people hard, but it is not physical enough for me. i needed 10 extra pounds, and instead of just hitting training table 3-4 times a day and just stuffing myself- i started juicing instead. i gained 20lbs., and two years later, i am starting and i have a pretty decent shot at the nfl (barring injury, in our sport, shit happens quick).
BUT (and this is important so listen), i never felt comfortable playing w/o juice after the first time i used it, and probably never will. i (and some of my teammates) have to go through some uncomfortable and sometimes stressful shit to pass the testing, and the amount that i use (and can get away w/) is just over the amount my body makes naturally anyway. if i get caught, i am FUCKED, but i don't want to quit b/c of the edge psychologically and physically it gives me- i do go off-cycle, of course, but the ups and downs and the stress of possibly getting caught may very well not be worth it to you. this is not a morality speech- i see nothing wrong w/ what i do- the guidelines against steroids are not my rules- i think the use of performance enhancers should be decided by the athletes, not by the shitheads who write/talk about/make money off of them- they are not the ones putting the work in (the blood, sweat, and pain). my advice- eat eat eat- you can put the 15-20lbs. of bulk you need (it may not be muscle, but you will weigh 230), or get a speed/agility coach, work your ass off, and move to safety. good luck to you bro- we are all in this together