It is always hard to be a grow up.
Sometime people have to give up something in order to achieve thier goal.
Given up is hard but that is true in a real life.
Over thinking would make thing more complicated than it is.
Learn form your mistake is good; however, what you are going to do in the future would make a different.
Be brave and believe in yourself.
Start doing what you must do right now.
It might not be fun, but aleast it is meaningful.
You can always have fun later, and I don`t think you will have a problem about that.
Maybe the first thing you should do is not to be late again. That would hurt you a lot no matter at school or at work.
I hope you can really do better for yourself.
I don`t think you can ever be a happy person unleast you can be a successful in any ways.
I wish you have a good time in hk.