There have been people complaining about "missed opportunities" since bitcoin was sub $100.
Take a look at this guy:
Did I miss an opportunity? At what point would you say is too high to buy?Here he is lamenting that he could have bought in when bitcoin was 42 bucks, but now it is over 100 bucks, so what's the point?
What about this post:
ever had a huge opportunity stare you in the faceThis is a particular favorite post of mine. The price of bitcoin when that post was made was $123. The user is complaining he could have bought in 2011 and missed the opportunity which was "staring him in the face". He signs off the posts with the following sentence:
I constantly have this feeling that something is staring me in the face and I'm missing it.
Here is he is, posting on a bitcoin forum, with bitcoin at $123, saying he feels he is missing something but can't quite put his finger on it.

Here's another one from a few years later:
Regret and depressionBitcoin price at the time: $230. Complaining he didn't have the foresight to get involved in bitcoin early, and could have been a millionaire. If he had invested then instead of complaining, $12,000 would have made him a millionaire at the ATH.
In 10 years time, there could very well be people making the exact same statement about you complaining that $13k is too expensive to buy in.