I have to admit that it is strange for someone to talk about 2013 as something that was too late, in this case for cheap BTC - but considering that OP registered on the forum at the end of that year at a time when the price was around $1000, which was then a really big deal. That year was really fruitful, because at the beginning of the year the price of 1 BTC was only $22 and the jump to as much as $1000 was amazing.
Of course everyone would wish they had been able to buy 100 BTC for $100, but is anyone other than ourselves to blame for this not happening? Let's not be greedy, especially those who learned about BTC 5+ years ago, because anyone could easily accumulate at least 1-2 BTC to date, even if it was just a claim on faucets or participating in signature campaigns - let's consider ourselves lucky for this opportunity.