Eventually, you will find yourself in the presence of someone who is better at all of the things you're good at, and whom you can't get away from until they've demonstrated their superiority, and maybe not even then. It might not even be a talent; I'm living in the same dorm as my ex-girlfriend's new boyfriend, and I can already tell they have everything we had, and more.
Everyone will be forgotten someday, likely shortly after they die.
There will always be times when, no matter how hard you try, you can't make a difference.
If you think she's out of your league, she probably is.