What if my minecraft won't allow to play multiplayer?

I was playing minecraft blitz surivial games and i died and minecraft crashed and it never let me play multiplayer, it always said play demo.

I Had my minecraft modded but it was only optifine 1.7.9
and the blitz server was modded too
i reported it to mojang and they told me to report it to hypixel but nothing helped

i just wanna see if there's a way to tell them my minecraft will only play demo mode
I had minecraft since 2011 and i can't imagine my life without it so please help me with minecraft
minecraft is my life and i really need to play my multiplayer to survive and i don't have multiplayer cause it will only let me play demo

If i were to get help can you contact me on fb => Facebook.com/terhelladam2 or Facebook.com/taliy.ferraro.9
or on twitter twitter.com/terheller
or msg me on kik = Username: Terhellee
Please contact me right away if you know how to fix this i need help
i wanna be able to play with my friends on minecraft and i can't life without it i really need it.
I may seem like a gamefreak but thats how lots of guys are they need their video games yenno there babes there little play thingy they need video games in there life cause it is a big thing
they had video games by there sides and video games seem to treat men more better then girls do
you can do anything on video games including build a house on minecraft
look i'm only 14 and i need my minecraft i had some girlfriends but my video games seem to treat me better
I can really use help

Maybe wait for 1.8 to come out. There are ways to update it to 1.8 already, but I don't trust them. Sit tight and wait.