24 and I haven't fully developed, very worried, thoughts of steroids, need advice.

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Talk to your doctor about Klinefelter syndrome.
Make sure your doctor checks testosterone levels, thyroid, cortisol and all other sex hormones. Would also be good to get an IGF-1 reading.
Make sure your doctor actually knows about these issues, most do not.

Final note, 2700-3500 calories is not a lot of calories...it's not a tiny amount but not what would constitute "a lot." Eating more might help to a degree, in fact it probably will, but it does sound like other issues are present.

Disagree. he is 126 pounds and eating in excess of TDEE. for a small person, this is a lot. Assume a moderate activity level, and disregard bf% for calculating TDEE using the Harris-Bennedict equation, then his TDEE is 2432 cals per day. So if we take the average of what he said at 3,100 cals/day (2700 - 3500 cals/day) then that would mean he is eating at 668 cals/day above TDEE, which would meet the very vague definition of "eating a lot". He is certainly not eating in a deficit nor is he eating at maintenance. at 600+ cals/day above TDEE, in the long run he will grow, unless contstricted by an over active metabolism or other such malady that impacts metabolism