Hello 
I know this is a vegan forum but I can't see a vegetarian one so I hope my query is still relevant here. I'm sorry for the long post:
For years I have wanted to become vegetarian with the mind to possibly become fully plant based someday if I could learn how to properly substitute meat and dairy without a deficit of essential vitamins etc. For now, I think a gradual transition of dropping meat, some dairy etc would be best for me so it's not such a huge lifestyle change and so daunting. I have started avoiding meat for breakfast and lunch, with 2 meat free days a week but want to take it further.
Those of you who became vegetarian/vegan from being omnivore, how supportive were your family/friends with this? How did you manage with having different meals to others in your household? If they made an innocent mistake such as serving you parmesan (with rennet) in an otherwise vegetarian meal, did they become upset when you explained why you can't eat it or did they understand? My DP will never stop eating meat and dairy, and I respect that because it is his life, his choice. What has stopped me becoming veg so far is 3 reasons: I am a massive foodie and I have massive fear of missing out, especially when eating with family or eating out at nice restaurants because I want to join in what they're eating, don't want to feel odd one out, especially when eating somewhere that offers awful or no veg/vegan subs. My second reason is I hate food waste so much I try my best to use up everything I can, to also save money (DP unfortunately isn't so frugal so doesn't mind throwing food out left to go bad and I am worried he will buy too much for himself and waste it, so I usually try to use up the leftovers) and it is easier to buy and cook the same for two with less waste than for one. Also would need to cook separate meals every evening! My third reason being that I don't like to feel like a 'burden' if people would need to cater for my specific needs e.g. meat/dairy subs.
I believe my family would be understanding and supportive of my choices because they know I am not a preachy, pushy person. I try to make eco friendly choices and care about climate change also but never force my views on others, as a kind of 'silent' protestor of plastics.
The only person in my family who is vegan is my SIL as she chose not to eat meat and fish when she was a child and has always had various allergies: nuts, milk, gluten. The family have always accepted and catered for this, including DP although I do think he finds this a nuisance from time to time, and I hope he can support me in the same way - he did pull a face and eye roll recently when I mentioned I want us to reduce our plastic use in the house, though he did say, oh I was only joking when I told him I felt disheartened.
My main reasons for wanting to at least go vegetarian are environmental but I also have been struggling between eating meat and seeing the living, breathing animals in the field. I don't cope well with feelings of guilt. Over the past few years I have gradually started to dislike the taste and texture of meat/fish and find it grosses me out more often than not.