1. I'm debating between... [option A and option B] 2. I can't make up my mind. 3. I'm on the fence. (= I'm in the middle, I don't know what to decide) 4. I'll take that into consideration. 5. On the other hand... 6. I'm having second thoughts. (= I'm reconsidering my decision) 7. I changed my mind. 8. He convinced/persuaded me to... 9. Looking back, I know it was the right decision. 10. It's up to you. (= You can decide)
You will not live long enough to figure it all out for yourself. And what a waste it would be to try, when you can learn from others who have gone before. Ben Franklin once said, Men can either buy their wisdom or they can borrow it from others. The great tragedy is that most men prefer to buy it, to pay full price in terms of time and treasure.