I don't get the following:

People are like: 'I wish I bought Bitcoin when price was lower,' and: 'If it crashes to $100 I will go all-in.'
Then price goes down, those same people cry...

How's your attitude toward the daily bitcoin price?

I have no emotional feelings associated with the price. Also, I buy more bitcoin every other month.
I'm invested because I appreciate bitcoin and I see my investment become valuable at some point in time.
When the price is down I see it as an opportunity to invest at a more favorable price.