If you want to feel even better about owning 100 coins, look at the Pareto distribution for wealth. If there are millions of people with Bitcoins, an individual with 100 BTC is somewhere in the top 1%.
Challenge accepted. Say 21M people with Bitcoins (and of course a total of 21M BTC), using Pareto this leads to:
21 M people.
~1 BTC per person
-----
Top 20% 4.2M people
80% of wealth 16.8 M BTC
--> avg 4 BTC
--------------------
Top 4%, 0.84M people
64% of wealth 13.44 M
---> avg 16 BTC
-----------
Top 0.8% 0.168M people
51.2 % of wealth 10.752M
--> avg 64 BTC
---------------------------------
Top 0.16% 0.0336M people (33600 people)
40.96% of wealth 8.6016 M
--> avg 256 BTC
---------------------------------
Top 0.032% 0.00672M people (6720 people)
32.768% of wealth 6.88128M
--> Avg 1024 BTC
So the average person has 1 BTC
In the top 20% the average person has 4 BTC
In the top 4% the average person has 16 BTC
In top top 0.8% the average person has 64 BTC
In the top 0.16% the average person has 256 BTC
In the top 0.032% the average person has 1024 BTC
etcetera. Note that this is these are averages so the lower bound to be in a echelon is lower. So with 21 BTC you are likely still in the top 1-2%.
Also note that this is with ONLY 21M Bitcoin holders. There will likely be many, many more