If you feed/sleep right, your energy should come right back at your age...
You are as thin as I was at your age and I as under eating. You could probably add 500-1000 calories and do well.
"...strength is built one recovery day at a time..." -OMP
"Do not change shit up during a training cycle." -Sandbox
Best PL total: 1020 - 350/265/405
Current total: 945 - 335/245/365