I understand the feeling because some of us here made the same mistake, we didn't buy when we were introduced to Bitcoin while some of us didn't take our Bitcoin investment seriously and we sold it early or lost it in our attempt to double it. If there's anything I've learnt about life is not to wallow in my past but to make the future counts. So I don't think you're late if you grab a bag now and hold because no one knows the future of Bitcoin in the coming years. Use DCA and be filling your bags gradually, and I'm sure in years to come you will be very proud of your decision.