Bitcoin is not a bubble because from 2009 its showed its ups and downs. If it is bubble there is no up and down in the marekt. Now the market starts to recover so dont worry about the price in downtrend. Hereafter the price will starts to increase so dont get panic and sell your bitcoin just hold it and wait till the market have tremendous growth. Then only you achieve your goals and earn more profits.
Yes, i don't think its a bubble because of its votality, the ups and down, but as you said don't be panic to sell or don't be worry because bitcoin price will rise ssoon.