Amino acids are the building blocks of protein. Soy is a popular vegan source of protein that provides all the essential amino acids to build a complete protein (though it doesn't necessarily have all of them in large amounts). However if you combine a grain + a legume you get a complete protein. Baked beans on toast = complete protein. Dhal (lentils) with rice=complete protein. etc. etc. And you don't even have to eat them at the same sitting - within 10 hours of each other is enough.
The messages on soy are mixed. I suspect that if you eat it in moderation in a minimally processed form (i.e. not "textured vegetable protein") it should be fine, but I am not a doctor.
In short: In your case, you appear to be eating vegetarian, not vegan so you get protein from milk & eggs anyway and don't really have reason to eat soy unless you want to. If you do go vegan, so long as you eat grains, nuts, seeds and/or legumes daily you should get plenty of protein and you still don't really have reason to eat soy unless you want to.
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