I was vegan for about 6 years and felt guilt when I moved to just normal vegetarian a few years ago. I felt ashamed when I would tell people who weren't even veg. I felt even MORE ashamed when telling my online vegan community friends.
I can't foresee myself ever giving up vegetarianism myself since it's been 10-11 years now and my body is used to it. However, seriously don't let ANYONE tell you what you should eat. It's YOUR body and your life. No one should make you feel bad. It was your choice to go veg and it's your choice to go back.
I will probably go back. It's nice eating meat again, and it's much easier on the budget (which is extremely tight right now), but the feeling I get is frustrating. I won't lie, meat tastes good. That being said, I feel guilty about eating it because I don't like that animals have to die just so I can eat. Yeah, it's nature, but I am aware of it, and I don't like it.