not watching the same TV shows as everyone else;
Well, I don't watch Strictly or Love Island, but I do like The Traitors, so in this regard I'm not so much unconventional as inconsistent.
not owning a TV at all;
Nope, got one. But only one, and it's in the living room.
not getting up as early in the morning as other people;
I'd love to not get up early. But I have 1) a job, and 2) cats who demand food. So 8.30 is a major lie in.
not adhering to 'wedding etiquette';
Depends whose wedding. If it's someone else's and I've been invited, I go with what they want, because manners. On the other hand, my DS (foster) is getting married in the next few years. Same sex couple, it will be small and very informal, and before the wedding he will be deed polling to take my surname, And his mum will not be invited. Not very traditional.
putting your Christmas tree up/taking it down at a certain time because that's when you're 'supposed' to do it;
No Christmas trees in this house, because cats. Instead I have fairy lights strung zigzag across the room and our ornaments hang from those. They go up when we have a weekend when there's time. Ditto taking down.
not drinking tea or coffee;
You will take my filter coffee out of my cold dead hands. Tea? Herbals only.
going on holiday alone;
I would, if I could get someone to cat sit.
not owning a car or being a driver?
I'm from the Netherlands, and I didn't own my first car until I was almost 30. I didn't need one, I had a bike and actual functioning public transport. Here in my part of the world where the last bus on a working day leaves at 6.15, there's not really any other options.
I do think I'm pretty normal, blue hair notwithstanding.