Bad really bad time of my life at the moment?

It started ages ago i used to go in my mums room everynight and talk to her, about 4 years ago when i was 10 now im nearly 15 and i dont do it anymore, i just go upstairs and conceal myself in my room Normal for a teenager huh? the previous week i even spend 13 quid on a kfc for us because i wanted to spend some time together like she said, when ever i agree she wants to bring my stepdad along which is annoying because i just want us 2. and schools going ok but some lessons im finding crap and unfair and home life is rubbish at the moment, i mean i cant seem to do anything right. For instance my mum just got back from collage and she brought my a loveley t-shirt and tie and a cardigan i loved it. she shouted me tim! get down here! i came down and she held then up infront of me nd i said are those for me? surprised about it and she went off on one about how im ungratefull and she shouldn't have bothered before she even let me say thanks or anything, ive apologized several times, but it makes no difference, i feel like going to smoking/drinking/cutting myself again because it did help but the consequences after like loosing my friends would be too much. ive tried talking to her, ive tried saying counsiling but she keeps saying no because your the child and im the adult, what the hell should i do?