I have a general rule of three meals a day and trying to have minimum (approximately) 30g of protein in each. I don't weigh or track my food, I have learned what 30g of protein looks like though.
So breakfast might be eggs on toast + greek yogurt and fruit
Lunch homemade (so extra) chicken and veg wrap, protein yogurt, crisps
Tea - beef chill, or chicken fillet chips and veg, salmon and sweet potato, baked potato and tuna.
I snack - I love chocolate, and nuts - and I use mayonnaise, butter etc quite liberally. I enjoy myself when I eat out.
I strength train twice a week and do other sports that require strength, and have done for a few years.
Most online calculators tell me that I need around 1600 calories a day and would need to eat 1300 to lose weight. It has taken me a while to build enough strength to get to this point, but a few months ago (last time I tracked) I was eating around 2300 calories a day and lost weight eating 1950. I'm in my forties. At 18 you need more calories anyway.
Please think about fuelling your body, and please don't calorie count or track food if you have a history of disordered eating. Id recommend looking up the Mind Pump podcast episode 'why women should bulk '
Personally I hadn't realised that every time in the past that id started a gym habit I'd also tried to 'eat healthy' which meant I cut out sweets and snacks and inadvertently cut calories at the same time so I never made much progress (you can't really get stronger on a calorie deficit, it's rare) Ever since hearing that episode I try and eat 'normally' but with enough protein and I've gained so much more strength. Eating enough protein means I'm too full to overeat things like chocolate and it sort of regulates itself. I'm a whole 2kg heavier than when I first started, a dress size smaller and hell of a lot stronger.
Good luck!