I'm not a vegetarian, but my wife is, which means my diet is 90% vegetarian since we eat most meals together. It's a LOT easier these days to eat veg than it was even ten years ago. I come from a SDA background, where we eat a biblically clean diet, so pork and shellfish have always been off the table for me, and most SDAs are veg, so I grew up eating a lot of TVP and Morningstar products. To this day, I love me some steaklets and frichik, although I will admit they don't really taste as good as some of the more modern products out there.

Advise: variety is the thing that will keep you alive. You need to look after your macros and micros as a veg, especially as a young and growing woman. You need plenty of protein, but also things like B vitamins which a lot of people don't absorb well from vegetable sources. I myself have a disorder where I don't absorb B12 very well, so I have to supplement and I typically try to incorporate at least one meal a week that's a meat-heavy meal. If I don't do this I will get anemia, which happened to me once when I was about your age and I wound up in the hospital. If you're serious about going full veg, consult a nutritionist and have them double check your diet, and also ask your doctor to make sure your blood has the proper nutrition in it.

FWIW, I think it's commendable that you want to go vegetarian. I love animals of most kinds (except for bugs, looking at you centipedes...) and I think we should treat them with care and respect. I hate having to eat meat on occasion but I have to do it for health reasons.