18 years old? Here’s the thing you need to hear.
First of all, happy birthday! In my country, 18 years old means we graduate from high school and ready to face the world (university, work, or... marriage, yes).
If I were able to talk to my 18 year-old self, I would give the same advice to you what I give to her:
1. It's okay if you haven't figured out your dream(s). Some people need more time and more experience to figure something out what they want to do in their life. You're not the only one, dear!
2. Maybe you are trying to date for the first time. Honey, if you do want to date, listen to your instincts. I hope you only meet good people in your life--but if you do meet bad person, please get away as soon as possible.
3. Just because you're now legal to do some stuffs, doesn't mean that you have to do it. Some things just don't suit you, and you don't need everyone's approval if you don't want to do it.
4. You're amazing and will do more amazing things in the future! Try to believe in yourself more!
5. Don't forget to give yourself a me-time! It's important to keep you content and sane; it works for me.
6. If some people told you your hobbies are childish, don't listen to them. It's your hobbies and you feel happiness from it. Again, you don't need people's approval for your own happiness.
7. In case it isn't clear, you can't please everyone.
I hope you have a happy year ahead!