How do i get into foster care?

I'm 14 and i'm in-love with an 18 year old, i know it looks bad, but i seriously know that he's in-love with me too. I'd do anything to be with him. My mam thinks he just wants and claims that she's lost sleep over it. I met him at cadets, and i fansied him loads. at first we were just really good friends, then it blossomed into something more meaningful. all my family are sayin that he's grooming me, but they dont know him, they only know his age. i'd do anything for him. i've been thru a lot of **** with this...and no1 but my friends understand. it's not about , he said that he's willing to wait....he said he'd wait 2 years!!! that proves he's not in it for ! he hasnt had a very good past, but he's the most decent boyfriend in the world....he gives me everything, and he's really nice. my mam's threatened that she's going to get the police involved, and take my phone in2 the station. she wont let me see him, she takes my phone off me at 9pm EVERY night, takes my laptop off me at 10pm EVERY night....i'm not allowed to go on my cadet weekends so that i can improve and succed in becoming a lance-corpral. I'm falling behind with my cadets.....she checks EVERYTHING. I'm not allowed out on weekdays, and she must know every single detail about my whereabouts on the weekend. i must be in at 6pm the weekends. I hate her so much and just want to leave so i can be happy. she's wrecking my life! I'm in top set at school and work really hard, she doesnt notice......she's getting my head of year involved and meeting the head master tomorrow. she wants to talk 2 my cadet sergents about it. the boy isn't even in my detachment! He lives in newport and i live in caerphilly. all my friends say it's unfair and hav offered me a place to stay. my boyfriend keeps apologising for everything, even though it's my choice. he says "i just want your family to like me". he wants to meet them all and wants me to meet all of his. but how can i, when i'm under house arrest?!! my mam says that i'm a horrible daughter...but i dont think that's true. i just want to be happy...is that so wrong? i just want to be able to do my own thing, and have a little freedom. My boyfriend is the nicest boy you'll ever meet. He's offered to hav a sit down with my mam so calm things and talk it over, but she responded by snatching the phone out of my hand and shouting down the mouth piece, "phaedophile!" he doesnt deserve it, and i've been beating myself up over it. i've ordered pills online and i've hidden them in a box...i take a couple every now and then....it helps with the stress. i sometimes just sit there, when i'm on my own, and i just look at the pills and think..."it would be so easy". I was going to do it, but i though of this boy and couldn't bring myself to do it...i can't leave him. he's given up smoking for me and he's bought me a braclet. he's only been nice and understanding, and offered to beat up my ex boyfriend after he kkicked me and severely bruised my leg. my mam didnt even know..... i dont know what to do....all i know is that i want out, i want to be happy, i dont like my mam, and i dont want to be forced into suicide! please, can somebody help me and tell me what to do?