It worries me when all your assets are not enough to own a bitcoin. Although investing in bitcoin will not let you down, but the plan can't keep up with the changes. You can still save more money in other areas within two years A rainy day.
Make up your mind. If you're confident that Bitcoin won't let you down, then why are you still worried? It doesn't matter if you own a single coin, many, or fractions of, you're protecting yourself against longterm inflation we know for sure affects fiat, and that Bitcoin so far shows it can overcome.
Forget the downs and ups, remember the cycle after cycle performance.
Two years, too short... You need to start thinking minimum 4-5 years (one halving).