Im grounded again please help?

hiya well im grounded again for goin out a getin drunk , 1st time i ever done it i got grounded fur like 4 month got aloud bak out on boxin day and done it again then got allowed bak out last weekend my mum knew that i was drinkin so everyhing was fine on the friday then on the saturday a was tao be in for half 8 to babysit my nephew but didntcome in atawl n they found me in a field so im completeley grounded again am 13 and have to sit in on a friday n saturday wen all ma pals are out getin drunk , ano ano afore neyone sais dont drink then av got ocd n scyofrenia n the weekends are what keep me going frew the week knowin that i can get drunk and forget everyhin thats the only timea feel happy n all my problems go away or when i smoke weed i know i think i have a drinkin problem but what tennager disnt wanto get drunk ad do nething just to get out a not come back and jus get soo fuked up that al my problems went away , i really want out tomorrow please help me a way to convince ma mum a cant say a wontdrink cos i know a will but she dosny even let me stay at ma friends if she did she woulndt see me drunk its like 2 o clock in the mornin and i was thinkin about cleanin all down stairs stayin up all night just so i can get out please help mea jus wanny die sometimes cos of my head its so fuked up please help me find a way to get out please im beggin , thankyou