Can I tell my dad about something in my life?
What do you mean? Why do you want to tell him about your life?
He is my dad and I thought he could offer me some solutions or share my pain
It is good to get help from family members. If you need more help it might help to seek a professional to talk about your problems with.
But what if a therapist just goes and tells all my seccrets?
A therapist will keep it to themselves while they help you. But if you are still nervous seeking help from your dad is still a good first step.