Should have said - I've also always used Ms since I was quite young - still at uni, definitely. This was partly because I like the fact that it hides your marital status and partly because it caused flashbacks to teachers telling me off using "What do you think you're doing Miss Problem Of?"
Ultimately it's your own choice, and there are sensible thought out reasons to change - but I find it sad that a lot of people do it reflexively, and that it's almost always done by women changing, and men changing is never considered.
I hear and salute those people who thought 'this is battle I can't be bothered to fight, it doesn't mean that much to me and I don't want to direct my energy towards it'. I think it is a sensible feminist position to not change, but equally those who chose not to do it are probably directing their energy elsewhere in their patriarchy-smashing pursuits.
Ultimately we're all going with or kicking against the same rubbish patriarchal agenda. Finding a truly equal way of navigating it is nigh impossible - we make the compromises we have to.
Unless you're one of the cool kids who both picked a new name. changes entire family's name to Wollenstonecraft going back 20 generations