Depression or just crazy?

I'm 11.
People usually think I'm 14 because I go everywhere by myself on my bike. But I've been doing that ever since my dad had a major heart attack a couple years ago. I used to go everywhere with my dad but when he had his heart attack he doesn't usually go out much anymore and my mom has always been playing this game called toontown so I just go get groceries and stuff in our little mini-sideroad-mall. I even ride my bike to the doctors and dentists.

I seem happy and nice but things really annoy me easily and I always stay in my room with my cat, crying and watching tv. Whenever I can't do something right I start crying and when I cry really loud and my mom doesn't come in to see whats wrong, I'll shut up and just cry not as loud. . .

My parents say they would divorce but they don't want me to be raised by just one of them and they always fight and yell and vent about their problems with each other to me behind the other ones back. So I don't want to vent any of my problems to my friends because I don't want to make a awkward type situation to put them through. Especially because I know how it feels. . . Not to great.

Hm. . .This is getting long.
So anyways, my test score was 60 and I'm wondering.. .

Depression or just crazy?

-Suicidal thoughts.
-Crying
-(No cutting - ouch! Terrified of pointy things. Eh. Maybe I'll cut with my finger nail.) ;P
-*Crazy talking to cat syndrom!!!* Lol. . .
And. . . soooo yea.

Depresson or just crazy?