Don't worry mate you will surely get better in trading as you learn new lessons every day and you will someday reach the point wherein you make good decisions most of the time and profits from your trades. Just always remember that something that is not yet sold, despite a dump is not a loss because it might go up again anytime in the future. Also, remember to not lose sleep because of thinking about the money you lost and will lose in your future trades since there are always risks involved when trading.