wide open space

what a mess..
i've been working in my office for a year.. and along the time i work alone. Of course with guidance from my managing director who's background is from design. And every month since last year, i asked for another designer. An art director if possible.
With all the loads of work and tight deadlines, i need help. It's been also brained damage me. Without a sparing partner, how will i know i was doing a good job. All i know is my creativity is not expanding, just plain dull.
So, my boss suddenly grant my wishes. when my new partner came to the office that morning, my boss made a little meeting, introducing him as the new graphic designer, and me as the art director. wait.. What?!
i never ask for this. i'm not ready for this. is he out of his mind. maybe he is.
God o God o God... how dare him! should u be ask for this kinda decision?.. i mean i have a right to say no, right? but i just go speachless..
i mean i cant just say i wont infront of the new guy.. it will ruin my credibility.
when i told this to 2 of my friends, as a panick responded. both say that it's a good news, that means somebody have faith in me that i'm capable.
but i never asked for this. atleast not now, not this time, when i am not sure of my ability.
for cryinoutloud i just worked for 2 year only, never with a guidance of an art director, i dont know an AD supposed to do.
my sister said,
what are you fussing about? i'm fussing about everything that came out from this company regarding artistic is now my responsibility.
who's responsibility is it before? me, but i made the designed
so, what's the different? its different.
kakak, you just have to see it in a wider scale, a bigger picture.

have i been living in my own glass ball, when its time for bigger opportunity i'm affraid that it'll ruin my space.