Read my 60 Seconds Guide to DOSBox (and don't just read it - follow it too).

If that doesn't help, come back with details on how you mounted your C and D drives, how you did the install, how you configured sound, music etc.

Reading the aptly named README file will be a good idea too.

I did read the guide.
AS I said, I can't follow it because the Z in the beginning won't go away.
I can't even get the files mounted!
I'm only 18, I could barely read when they stopped using this stupic computer-system!
I can't even get the basics 😢

Okay, you read the guide. Good!
How about following it?

I did.
I have done everything people tell me to do.
I keep getting a message saying "directory C doesn't exist" or that the name has more than 8 letters in it.

c: not cd c

I could barely read when they stopped using this stupic computer-system!

Hey! Show some respect ya whippersnapper! that "stupid computer system" is the reason we have all these great games to play.

And now, a poem:

In days of yore, eight bits a byte,
Computer screens were black as night,
When through the inky darkness came,
A savior! DOS, thy hollowed name,
Autoexec and Config.sys,
Direct control was total bliss,
No filenames stretched eternally,
We miss the days of 8 dot 3,
Thy faithful cursor blinketh bright,
In shades of Amber, Green and White,
No secrets hid, no truths denied,
In DOS all paths were true and wide,
Oh childe, oh yea of wisdom naught,
What hell hath Windows GUI wrought?
Forsake thy fancy DLL,
Grief its only parallel,
Dot com meant more to us than just,
a web address to sites of lust,
Those years have fled, and now we're stuck,
With much less bang for much more buck,
So think thee hard before yea speak,
Discouraging words that mark yea a geek,
DOS is immortal! DOS will live on!
When other OS's are buried and gone!

i was 15yrs old and had no problem learning to use dos, you can learn it too. except when it comes to the really confusing memory management stuff and setting up soundblaster environment variables dos is not hard. and with dosbox all of the hard stuff is already done for you so quit whining... back in 1996/97 for the life of me i couldnt get mscdex to work with my 6x mitsumi cdrom drive because i couldnt find any dos driver for it. i had to play dos quake with no music till i got a voodoo2 card which freed up enough ram so that i could actually play in win95... then came the fun of trying to play online, netquake was so lagged it was unplayable, quakeworld came out later on and can you imagine how fun it is playing quake with a ping of 500 on a 28.8 modem?!! the 56k modem was just invented and people had either an X2 or 56kflex because there wasnt even a standard yet for 56k modems. ahhh those were the days

dos tutorial
http://how-to-use-dos.blogspot.com/

dos command reference
http://www.computerhope.com/msdos.htm

p.s.
thats a cool poem 😁