It's best if I bottle up all of my emotions. I've  seen many people get hurt by letting all their emotions flow freely.
That sounds like an unhealthy plan. Why do you prefer to bottle all of your emotions?
It's not worth it to be sad
Keeping your emotions inside can lead to unresolved and hurt in the future. Instead, you should find an outlet for your emotions, even if you don't express it to others.
Nah, Just let the past go.
It's good to be able to let the past go, but you have to deal with things before you let go of them. When you don't express emotions or talk about how you're feeling, your really just holding onto all of that forever. You'll never really be able to let the past go.