To my 9-year old (almost 10!) sister, Hannah...
As your big sister, by 13 1/2 years, I feel that I should spread some worldly wisdom your way. Since, in your words, I'm "old" now...
Never let anyone bully you. I'm pretty sure they don't, because let's be honest, you talk everyone's head off, but that just makes you a people person...and that's ok. I think there is enough people person for you and me both in that little body of yours. But remember, bullies are people who deep down hate themselves and are putting you down to make themselves feel better. Just tell them you have a 23 year old sister that you're pretty sure could make them cry, that should do the trick.
Don't let anyone talk you into doing something you don't want to do. I've spent my entire life doing what everyone thinks I should be doing, not what I want to be doing. If you won't stick up for yourself, I will.
Continue to do good in school. I know you're bored out of your mind, but continue to excel. The one regret I have from my childhood is not applying myself more in school. It would have better prepared me for college. Remember, you want to be a Vet...so learning to study will be useful for you.
Keep playing basketball to your heart's content. Never let anyone make you feel like you have to play ball, because you don't. As long as you enjoy it, keep playing the game. You'll never know how much I enjoy seeing you get on that court and play. I teared up when you made your first shots this year because I know how determined you were to make them.
And last but not least, know that I'll always love you. Even though I get mad at you for back-talking me, leaving the house a wreck, and for not shutting up that mouth of yours...you still feel like my child (even though, thank God, I didn't birth you). You came into my life in the most unexpected of times but you've made my life better.