Don't try to justify a bad trade by convincing yourself that it will sooner or later turn into a good trade. Successful traders are able to ride through periods of drawdown. The confidence in their methods reassures them about their future success. The markets offer endless and plentiful possibilities. Missed opportunities exist only in your mind.
Prices keep changing and generate other opportunities.
Don't fight the trend. Forget the news, remember the chart. Predetermine maximum losses in every potential trade. Don't average your losses. Trade active stocks, avoid thinly traded markets.