There's no particular reason to take a vegetarian vitamin. What is important is to take a good quality vitamin, which means stay out of the drugstores and go to a good health food store. Whether you need a vitamin or not, nobody but you can answer, but just because you're not a vegetarian -- the vast majority of people aren't -- doesn't mean, I hope, you don't eat mostly vegetables. Some nutrients, such as methionine and B12, are very difficult to get in a vegetarian diet or a vegetarian vitamin since they're largely found in animal food, but it's easier to do in a vitamin than just by vegetarian diet, but since you're not a vegetarian you probably don't have that problem. I think taking a multivitamin is a good idea, because it's always been very difficult to get everything we optimally need in our diet, but mega-dose vitamins should be avoided.
sorry I feel like that is a really stupid question.