It's natural if you were doubtful about Bitcoin when you first heared about Bitcoin because in that year it could still be said to be in the early days where not much correct information was available about Bitcoin.
The correct information about Bitcoin emerged when Bitcoin showed what kind of currency it was. and you don't need to regret it if you feel like it's too late to start investing in Bitcoin, because the Bitcoin journey is not as smooth as you imagined and it's possible that when you started a long time ago you've now given up because there are so many incidents that raise your doubts such as news of exchanges being hacked and also countries that prohibit Bitcoin or other cases that have become a black mark on Bitcoin's journey so far.