I think that's quite normal, really. I mean for one, as they say, "you don't know until you try." You may see something you think you'd like, try it, and end up hating it - or find yourself in a position to try something you didn't think you'd like or even try, and end up liking it.
And of course opinions and situations change over time, so you may find yourself liking something more or less than you did previously.
I know my interests and tastes have certainly evolved over time.
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