I've taken some common advice and given my thoughts on each subject.
Enjoy the power and beauty of your youth: Don't let your youthfulness pass you by. Take advantage of opportunities that come your way. Don't be afraid to try new things or step out of your comfort zone. Realize that you are a beautiful person and don't be critical of yourself, sometimes the time to make things happen in the world is when you're young and people will still listen to your voice and what you have to offer.
Don't worry about the future: It is completely useless to worry about the future. How often do things actually go the way you think they will anyways? Instead use your energy for things besides worrying and you'll get more done and you'll be more prepared for what might come your way! And what comes your way might even be way better than what you could have imagined on your own.
Do one thing every day that scares you: I completely agree with this! This is sometimes my rationalization in getting myself to do things that might frighten me just a little. Or I often use this line on others in getting them to do something that might normally embarrass them. How else are we gonna grow as a person unless we do something that scares us every now and then. And I don't mean to get reckless in something harmful, I just mean doing something a little out of your ordinary routine.
Don't be reckless with other people's hearts. Don't put up with people who are reckless with yours: Sometimes people have to learn this the hard way. If a relationship always feels strained or one-sided, maybe it's just not meant to be. Don't punish yourself by staying in a relationship like that, there are way too many bad relationships out there, but always remember that there is a way out. Be strong and never let go of your sense of yourself. Because deep down, you know that you deserve better and if you are treating someone badly, that person deserves better.
Remember compliments you receive. Forget the insults: This one sounds easy in theory, but how often do we tuck that little bit of negativity in the back of our minds telling ourselves that we can't do something. All because some hair-brained person insulted us once way back, when their insult meant nothing more than ignorance. Focus on the positive good things in your life, don't dwell on things or people that only bring you down.
Keep your old love letters. Throw away your old bank statements: Keep reminders of the past that make you smile. Remember who you once were and remember the journey that brought you to where you are today. Plus bank statements are no fun to read.
Don't feel guilty if you don't know what you want to do with your life: Don't focus so much on what you're going to do with your life, because life happens no matter what. You might get a degree in one thing but find that your natural talents will lead you right back to something completely different. And that's completely fine. People of all ages discover new career goals and new aspirations at any age of their life. Take pride in your work and do your best at what you love.
Travel: Get out there and see things, travel as much as you can, and meet new people. Don't get stuck in a rut. I find that travel rejuvenates me and makes me want to rediscover things all over again. Take a soul vacation where you reconnect with yourself...do things like travel or whatever you enjoy to relieve stress and get away for a few days! And when you come back, things might seem brighter. Sometimes you just need to clear your head by seeing a change of scenery for a little while, or sometimes you just might need to reconnect with some old friends or family members.
Be careful whose advice you buy: There is alot of bad advice out there. Learn from others and learn from yourself. The more you live and grow, the more you'll know what works for you and what doesn't work for you. Have a good support network that you can trust and call on, just to talk to. And be there for them when they need to talk to you as well. Life is really not a harsh place when we can count on others and when we can count on ourselves as well.