hey man, welcome to the forum first things first, mixes get posted in the djing forum, not the production forum, no one will reply to you here if you post mixes.
I did however listen to your mix as it stirred a little nostalgia (seeing Netsky play out made me want to start mixing
) and will reply this once
did you use turntables? cdj's? laptop? if you used one of the first two then its not too bad considering its your first mix, fairly simple transitions with almost no blending but at least the tunes were fairly synched.
my advice:
listen to more dnb, dont mix one producers tunes its far too samey, also 30 mins is sort've the minimum sortve set you should aim to record
learn about eq blending and double dropping (check out the dj'ing forum)
practice, practice, practice!
Hope that helps