It could be you are not getting complete protein chains/aminos because you aren't eating the right things in the right combinations. It is absolute rubbish that being vegetarian or vegan is not healthy for you. Done properly a meatless diet can do wonders for your health.
Anyway, get complete proteins - one easy way to do this is with Quinoa (a grain)
there are also many meat substitutions you can use that give you the texture you miss - Seitan for instance. Also you can grill a portabella mushroom and if you do it right it will have all the flavor of a burger. You can make your own veggie burgers too for cheap!.
Finally, If you want a really easy way to become vegetarian that will definitely make it easy for you to never go back look up the video "meet your meat" - it's a very eye opening expose on what actually goes on in many (not ALL) but many of the places where meat is butchered/processed. That sealed the deal for me! If you don't know where it's coming from you may be inadvertently contributing to the abuse and suffering of animals. I didn't want that on my conscience.
I actually am not morally opposed to people eating meat who raise their own and humanely butcher it - most people don't or wouldn't do this themselves.