Fussy eater please help

I'm vegetarian at the moment and wanting to go vegan badly! But since I've gone vegetarian I haven't eaten much at all! My parents are very concerned! I've tried to eat lots of different things and I just don't like it! I hate my homemade veggie burger I don't like the soy milk I bought I don't like tomatoes, salad and all that. I can't afford to keep buying things I don't like it's really frustrating and I wish I could eat all this healthy plant foods but I don't like it. I put mushroom on my vegetarian pizza and hated it! Please help! I'm 17 and my parents think I'm gonna end up sick in hospital.. And I don't feel hungry very much anymore either 😭