Learn how to weed out toxic people, including family. Some people have a hard time with the 'family' part of that. But if they're causing you stress and anxiety, it's ok to remove yourself from their presence.
It's ok to put yourself first once in a while. Don't live for others exclusively. The universe will not mind if you take care of you now and then (and you'll actually feel better if you do).
If you want to travel, do it when you're still young. Once you're married, have kids, a career, it gets a LOT more difficult to figure out how to get away to those places you've always wanted to visit. Find a way to make it happen. If it's important enough, you'll figure it out.
Ditto on starting a retirement account ASAP. It's never going to get cheaper to retire. Start early and when you're comfortable, max out your contributions. You'll set yourself up well for your golden years.
Work to live, don't live to work. Too many people allow their jobs/careers to define them. I work for a paycheck so I can live and do things I enjoy. The job is just a means to an end.
If you can, marry your best friend. Keep each other laughing. Have ridiculous inside jokes that no one else gets. Share common interests. Looks fade, as does the 'drive' (for most people), but having true companionship is what matters.