how many calories do i need?

I'm 120 pounds 5ft 6 (18 years old male) I know I'm quite skinny but that's because I have a average/good metabolism, how many calories would you say on an estimate I would need in a day to just maintain my weight? I'm rather active, i get up at 9 and go to college and walk up and down stairs over and over again and all around town so i do alot of walking (i used a pedometer today and i did 19,291 steps that's like 9miles) and when i get home at 3-4 I'm doing work in the kitchen and the back garden, i don't sit down for very long only when i eat, I always keep myself busy. A dietician recommended me to eat 2700 to maintain my weight for my activity level and because I'm still growing and other things like hormones and stuff, how much do you think my maintenance is?

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