Do you live the "If only"-life? Constantly looking back, saying to yourself things like "If only I had spoken my mind", "If only I would have prepared better for that interview", "If only I had gone to study what I wanted."
How does that make you feel? I bet not very good. And really - what's the point? Can you change the past?
What's happened has happened.
Instead of feeling remorse of things not done in the past, try this: say "Next time".
"Next time I will say what I think." "Next time I will prepare better." "Next time I see a chance to study the thing I want, I will find out how I could do that."
Keep doing this and you'll notice you learn to concentrate on this moment, and to a better future. "Next time" gives you hope. There will be so many opportunities in the future for you. Next time you see them, grasp them.
Until next time!