Nineteen is a weird age...legal adult but still a teenager? As a nineteen-year-old, I feel I have learned a lot about life already, but I know there is still much more to learn. Having less than a year left before I am no longer considered a teenager (thank God), I have noted 19 key lessons to keep in mind for the rest of my years.

1. Emotions are temporary.

Whether it be happy, sad, angry, or mad you will not feel it forever.

2. Positivity is contagious.

Same goes for negativity. So surround yourself with people that make you feel good.

3. You can't change people.

You can change yourself, but you cannot change someone else. Move on and accept a person for who they are, both the good and the bad.

4. Your failures are accomplishments.

Yay! You failed! Own it!!!

5. Cherish everyone and every moment.

These things and these people will not be here forever.

6. Sleep and water.

Very important, get enough of them.

7. Happiness is a decision.

Choose to be happy.

8. Not everyone is your friend.

And not everyone will like you; that's okay.

9. Don't second guess yourself.

Because then you'll second guess that decision, and that one, and maybe that other one, and end up going with your gut anyways.

10. Not every decision is life shattering.

Life will move on.

11. Your opinion is important.

You feel it, so it means something. Don't be afraid to say how you feel.

12. Be selfless.

Other people are important and their opinions, thought, and feelings matter.

13. Be selfish.

But you are more important so do what makes you happy.

14. You are never alone, so don't think you are.

You have someone, somewhere who cares about you and loves you so don't ever feel like you are by yourself in the world.

15. Don't try and justify your feelings.

They are feelings and should remain just that. You do not need facts and reasons to explain the way you feel.

16. It's okay to be unsure.

Whatever it is, you will figure it out eventually.

17. Stop apologizing.

It's not always your fault so stop apologizing for everything.

18. It's okay to be wrong.

Learning from your wrongs can be more beneficial.

19. Be passionate.

With everything you do, to everyone you encounter.