Dude, you're 18. You may not finish growing and filling out until your early twenties. Also, muscle actually weighs more than fat, not the other way around.
Don't worry about it too much. If you're getting a good amount of food and you're not losing any weight, than you're okay. If you really feel like you need to bulk up you can take weight gain powders, but you'll lose all of that definition that you've worked so hard for if you're not going to the gym at the same time.
You're roughly the same height and weight as me (I'm an inch shorter and ten pounds heavier) and when I was younger I went through the same thing. You will fill out. Enjoy it in the meantime, as when you're fifty and can't get rid of those love handles you'll sorely miss being so lean.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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