Go ahead and look at the price history of Bitcoin since the beginning.Then analyze it's growth each and every year pass. Remember the cycle on how many months/years before Bitcoin crashes, recovers, and pumps.
Looking at these will give you an idea whether or not you'll end up 100% losses when you put your money in Bitcoin.
I believe, you will never have losses if you don't sell during the bearish season. Just hold it still for long term, be patient and you'll never get to have losses.