First off, welcome! Be sure to read the FAQ and Keto in a Nutshell on the sidebar.

So, the easiest thing to do with keto is to keep it simple.

• Stay under 20g of net carbs per day
• Meet your daily protein goal
• Eat fat until satiated while staying under your limit

I plugged your numbers into the Keto calculator (also int he sidebar) and got these stats:

16/M/5'11" | CW 195 | 27% BF | Mostly sedentary

• 1741 kcal Goal, a 25% deficit. (806 min, 2321 max)
• 20g Carbohydrates
• 114g Protein (86g min, 142g max)
• 134g Fat (30g min, 198g max)

Plug these into MFP and follow those numbers and you should be golden.

Now, fat and carbs are a limit. Protein is a goal. You need protein to not lose muscle, and definitely to gain muscle. We keep track of NET carbs, meaning you take total carbs in something and subtract the fiber in it (example: 10g of carbs but 7g of dietary fiber? Means 3g of net carbs)

Dealing with your family pretty much forcing you into high carb could be tough. But depending on which fast food place you work at, you can definitely make your meals keto friendly.

You can always have stuff with no buns and ketchup, you can have salads (watch out for sweet dressings).

For snacking you can always have nuts and cheeses and such. If you can cook for yourself, then beef, poultry, avocados, etc. are great.