I had the exact same problem as you at your age as I was almost exactly the same height and weight. My receiving skills weren't fantastic and I could have been more physical, but my inability to gain weight kind of doomed me from the start. I'm strong for how skinny I was/am, but I just couldn't dig into the turf and get the push I needed against heavier players. I played as a reserve until I was convinced I wouldn't be able to gain weight. My advice is to keep playing and try your best to put on weight while you play. Because you're so thin you probably won't have a big role on the team right away, so I don't think you're putting your body in too much risk. I never got an injury worse than a slightly sprained ankle and a broken pinkie finger (neither injury was really related to my weight). It sounds like you're committed to football, so if you really want to play, just keep going to practice and trying your hardest both to gain weight and on the field. If you want to be a football player, don't give up until it's obvious to you that football isn't working out for you. In my opinion, being too thin isn't a reason to quit football unless you can't gain weight and you become certain that being skinny will be a huge problem for you forever as a player. Keep in mind that even a lot of great NFL players are pretty thin! For example, Randy Moss is 6'4" and he plays between 190 and 210 pounds and supposedly he has to eat like crazy to keep his weight up. DeSean Jackson weighed 155 or 160 pounds in college and he's still only 170 or so and clearly he's making it just fine in the NFL.