That's the thing: you don't need to own a full Bitcoin. That's just a dream so many people have but it's pretty unrealistic. Remember, you can own even 1 satoshi. Nobody forces you to own a full BTC to be considered a Bitcoin investor.
Yeah, the price goes up almost constantly every few years. That doesn't make it a "problem" to begin with - in fact, there's a very good side to it if every time you buy the price goes up, lol!