If you think Bitcoin is expensive you can decide to buy bitcoin in frictions and accumulate Bitcoin to the amount you desire. Bitcoin is not expensive like the way you think , just buy the amount you can afford to lose. Investing in Bitcoin doesn't mean you need to invest all the Bitcoin , it will be very wise for you to just invest in what you can afford to lose, do not try to force yourself on Bitcoin to the level which you do not see yourself in. Go for the amount that you can raise.
In fact, investing money in Bitcoin will never be lost as long as we are able to look after the Bitcoin very well in our own wallet, because a decline in the price of Bitcoin cannot be said to be a loss. But this is only limited to reducing the amount of money we have invested in Bitcoin due to the influence of the price decrease, but when the price increases, the amount of money we have invested will also increase so that it can produce more profits. So it cannot be considered a loss as long as we still hold Bitcoin tightly enough.