I was weirdly all onboard the GOP train in 2000 when I could first vote. >_>
Enthusiasm ebbed and flowed since then, didn't vote Republican for President in 2016 and voted purple in the midterms. I'm really sick of having Jim Jordan as my congressman. >_>
I was pretty squarely libertarian when I first could 16-19. I feel like that isn't uncommon for younger people who see the seemingly-fair principles that libertarianism represents in a vacuum (keep what you earn, keep out of people's business), without an appreciations of the societal factors that make going 100% Laissez-faire unfair to a society.
Most garden-variety libertarians don't stay in the laissez-faire phase very long, beyond factoring free-market axioms into their analysis.
They tend to drift towards conservatism, neoconservatisn, anarchism (left, even), hoppeanism, neocameralism, or occasionally fascism. Others really go in truly odd directions like anarcho-dengism, like yours truly.