Guys do I have any mistake so far please help I’m not that good in writing

Here is a good revision you should utilize:
Dear Diary,
I was very excited to move on with my life, but thoughts kept rambling within my mind; How can I support my family, my brother's education, and myself?
Answer:
Explanation:
You might want to use better words. Here's how I would write it. You're welcome to use any of it If you'd like. :
Dear diary,
I was extremely excited to finally move along and get on with my life, but a million thoughts and questions were bouncing around my head. Questions like, How can I support my family. I was worried about my brother's education, not to mention my own.
Hope this helps :)