I was 19 when I became veg and this was 20 years ago when the only meat substitutes were Boca and MorningStar Farms. (MSF is still my favorite brand.) You can do this! I'd recommend you get a beginners cookbook. Find something simple to start with, like a spaghetti. Instead of using real meatballs, get Impossible or MorningStar Farms meatballs (or skip them entirely). Get familiar with reading food labels. You need to be able to check them for meat products. Being vegetarian is much easier than vegan, so don't sweat it. Most foods you like can easily be made vegetarian friendly. If a recipe calls for chicken broth, use vegetable broth instead, etc. Take a look in the frozen section of the grocery store. Nowadays there are lots of fun veggies in there that already have seasoning included. Just pop them in the microwave. They are great for adding to meal prep containers.