The best advice I can give:

Be smarter than your clothes. If you're wearing a ballcap backwards and holding your hand up to shield your eyes from the sun, you aren't. If you are holding a veil, and your shivering or getting sunburnt and not using that fabric to cover your back and/or shoulders, you aren't. Even the tiny furry scarfs can be warm if you wrap them around your throat several times.

Save for emergencies and for your retirement. It's a long way away at 18, but that really is the best time to start. Don't put it off. I wish I hadn't.

Indulge yourself in moderation. Little things can mean a lot to brighten your day and your week. Send yourself flowers for your birthday or just because it's Tuesday. This is especially important to reward yourself for doing things you don't want to do.

Take care of yourself- you're the only you you've got. Physicals suck. Dentists suck more. But letting a problem build into something terrible is never good. Worrying about it doesn't help- it makes it worse. Give yourself a cookie for doing this.

Smile with your heart. Happy wrinkles are better than no wrinkles- beauty lies within the joy you share. It's amazing how much further you can go by smiling and being honest.

Lies suck. They build until you dangle from them. They poison you and those to whom you lie.

Love isn't a fairy tale. There is no such thing as one kiss that lifts you up to the heavens and is so damn pure nothing will ever get between you. Love is hard work to maintain. Fall in love over and over again- preferably with the person to whom you have committed. Work on that relationship and be honest with each other and yourself. Know what your bedrock is and touch on it often. If your love doesn't have bedrock, it's poppy dust.

Never ever let them steal your joy. Not for anything or anyone. You have to keep a laugh simmering within you - a light to brighten your darkest days, to guide you to brighter things, to hold onto your sanity.  ¶ 5:22 AM