Get to know better Vamp Rouge regarding her cosplay, where is all started, what inspires her, what cosplay took off and where being positive about her cosplay.
Just because someone does the same costume as you and gets a lot of attention does not diminish all the hard work and passion you put into yours. You should never feel defeated. Get inspired. Notice things you would like to upgrade for your costume and go home and work on that. Bring it bigger and better next time and your friends and peers will notice.