I thought about this recently, actually! I’m 27 so I don’t exactly have piles of wisdom to share, but there was one thing that stuck out for me.
I’d want to tell myself that going through one door doesn’t mean another door automatically closes. This is a bit of an extension on the old “when one door closes another opens” cliché, and I guess I mean that sometimes you think that you have choices in front of you, and that by choosing one you automatically reject the other, but I’ve found that’s just not true.
For example, as I finished my undergrad, I had a hard time choosing between continuing my studies in grad school or taking some time off to work. I thought that by choosing one I was denying myself the opportunities that the other could afford. But, I discovered that by going to grad school (which was the choice I made), I actually set myself up for amazing work experiences that I wouldn’t have had otherwise. And once I started working full-time, I discovered tons of professional development and continuing education opportunities. I realized that I had put so much pressure on myself to make the right decision, when either way I still had access to elements of both opportunities. I would have been fulfilled and just fine either way.
So, I would say: relax and have faith in yourself. You will find a way to do the things that matter to you - to be the person you aspire to be - no matter what.