If you wrote a letter to your 12-year-old self, what would you say?
Your handwriting is illegible, and you may not believe me, but that wont matter in the future.
Just work on printing, people can read that, and you will get better at it.
Keep on reading, keep on listening to people, and keep on making your own assessments and doing your own tests of what you are learning.
You may not know how to spell many words now, and you will learn that with practice. Machines will be developed that can check your spelling as you write, and your spelling will get very much better as a result.
Keep on learning, keep on following whatever takes your interest, and keep notes of those intuitions that come to mind.
Don’t be afraid to try things, and don’t be afraid to be a lone voice – someone has to be first, and being first isn’t often very comfortable.
Keep going, and don’t give up.