Over six and a half years, 21-year-old Rebecca Brown snapped 2,100 selfies, combining all of them into one fascinating time-lapse video. The UK-based student started the project back in 2007 when she was 14 years old, and she plans to continue "for as long as [she] can." In the video, Rebecca's style and features shift and mature, and she added powerful captions to certain frames to address what she was going through at the time. She candidly addressed her struggles with depression and trichotillomania, a hair-loss condition, and in a written Q&A, she notes, "Where does the smile go? Life happens, depression hit rather hard. I'm on the mend." Watch her compelling video above.