Well, I didn’t convert to Roman Catholicism, but I did go to some sort of small-c catholicism from a less catholic background (Anglicans can do that sort of horizontal conversion). It was a complicated process, but in extremely simplistic terms:
I grew up in a wishy-washy Anglicanism as a child, then moved to a very unwanted agnosticism/borderline weak atheism/irreligion in my early/mid teens. Then I went back to Low Anglicanism at 16/17, but became a very materialistic irreligious nominal Christian in my university years. I then became involved with generic Protestant Christianity online, a resurgence in serious interest in Christianity which led to actual Church attendance in “social justice” broad church Anglicanism. I was a bit disturbed at the emphasis on modern politics and contemporary cultural norms (usually leftist in nature) in some of the latter churches, at the expense of, well, Christianity. I was already personally leaning Anglo-Catholic while still attending lower-Anglican churches when I got a hold of G. K. Chesterton, who totally destroyed the fallacies that dominated within them and made it such that I couldn’t take them seriously anymore. At about the same time (during a philosophical crisis in which my long-held mechanistic materialist biases and metaphysical naturalism finally clashed with my increasing religiosity) I discovered Ed Feser. I then sought out an Anglo-Catholic parish.
Whew. The whole story is even more complicated.