I’m in a calorie deficit (without wanting to be in one)

i’m a 17 yo guy and i’ve struggled with ED earlier this year but i’ve also started to work out (5 times a week) i avoided tracking calories since then bc i was scared that it would make me feel bad but i recently started to do so and noticed that my bmr was 1600 cals (and with my activity level it apparently is 2500) but i’m not even getting 1500 and want to gain muscle but i’m still scared of eating more.
what changes could i make that would help ? or any advice in general is welcome bc im scared that it could impact my health :(