My feminism has changed with different issues being important with different phases. As a teen iirc it was the double standards around slut/stud, the double bind of be sexy/don't be a slag, the misogynistic words men had for women, porn, blokes talking about anal, shaved muffs, unattainable beauty standards.
It started to evolve and become more informed, learning abut MVAWG, etc.
A big game changer for me was working in a women only environment, which made me realise how much internalised misogyny I had, when I was genuinely suprised at how efficient, professional, effective and harmonious we were. It was an amazing revelation. Until that point I must have still believed women were 'bitchy' or perhaps even incompetent.
But becoming a mum gave me a whole new set of things to think about - it was pretty humbling. I realised what an ignorant arse i'd been about motherhood. It also made me stop giving a shit about a lot of what used bother me.
My feeling is that the personal evolution of feminism isn't linear and can have a lot to do with life events in that way, but sadly, also a lot of trauma.
More positive though, is if you have the good fortune to be introduced to great feminist books and great older feminists.
When I first got involved in feminist activism and book groups I remember thinking I had something original to add, but it had all be said before. It was so nice to have these older women sagely nodding along to my anecdotes that i'd fought so many frustrating battles to be understood by men who just tried to force me to accept it was 'all in my head' 