I feel there is no point regretting this. We have all been there one way or the other.  How you make NOW count is all that matters. The fact that your mistake slowed you back doesn't mean you can't learn from it and make tomorrow better. Few years to come, you will be happy with some of the good decisions you definitely made regarding bitcoin today. After all, what is of more regret than someone who had the chance to buy extremely cheap token in 2009 but blew it?