i guess the guys are not flirting with you because you are depressed not to do with your new haircut
your hair will grow back and you have to get used to the new style
you are still the same person with the same qualities that you had before
you could maybe colour your hair or but extensions in or even do your make up in a different way
are you depressed because of the hair cut or was the depression coming on before that?
just give yourself time to get used to the new style and ask friends and family what they think
when you next go out act like a really confident person and im sure the guys will be flirting in no time
best wishes