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Easy question. I'd skip all the small and bigger personal mistakes in my life. I'd also invest money into all the exploding tech companies and mine Bitcoin early on. And then see if being rich and "perfect" changes me or makes me happier or something. And since I can carry my wisdom over and don't need to study the same things again (from grounds up at least), I might be able to spend some extra time, train for another job, learn 2 more languages and a bunch of musical instruments.

Though from what I've learned from watching way to many science ficion movies, I'd probably end up making different mistakes. Or find out I didn't learn 5 languages because of a lack of time, but due to my character traits... And then somehow the movie ends with a confusing scene on how I might not have been born.