Ask HN: What would you do if you could start over?

Does anyone here feel like they took steps that ended up unexpectedly slowing their career/progress? If you could go back 10 years with the knowledge you have now, with the sole goal of having an idea that could be a successful startup, what would you do different?

I'm looking for things such as: -College major -Career field -Bad life decisions -Relocation -Finances -General personal development (Not work/startup related, such as working out) -Career development

Please feel free to add anything you think is fit, even if it isn't on that list