I would do what you exactly did back in 2011. But at the period, I did not know about bitcoin. I only knew about it in the beginning of 2017. That's why we should learn from our mistakes. We must seize every single opportunity and work hard because we do not know what the future holds. To feel dumb is not a mistake, but if you do not pay attention or try to improve yourself and remain in the dumb level, you will remain dumb forever.
While you lost the bitcoin train that does not mean you need to lose all the other trains at the station, look for an altcoin that you think has potential and invest in it, you could lose money but if make your homework then you could easily make incredible returns with that investment and then buy bitcoin with your earnings you had.