What am I getting wrong?

Hi, Im a bitcoin newbie. Im reading through the newcomer must read list on the bitcoin subreddit. The way I understand the bitcoin right now is that its basically a currency, not an investment tool. But I see people talk about the bitcoin's appreciation rate/how much it will be in 10 years/etc. I believe and hope that the bitcoin will function as a currency in the future and im planning to buy some every month – but i dont plan on selling for dollars because i hope i will be able to use it as money.

Am i missing something?