I really need some help...

I need some help. I'm 19 and I've recently come out as gay to some of my friends. My best friend, I've known for 18 years came out as gay last year but I always thought I was the gay one. I came out to him and we had our chat about me, and about his experience of coming out. I definitely don't find him attractive or any thing else, I see him as my older brother even though he's 6 hours older than me so I don't want any advice about getting with him because I don't want that to happen! ... I stupidly drunk told some of my other close friends that I was gay, not all of them, but I need to tell my mum and dad. I live with my mum, she is amazing. I know she won't be upset or angry with me for being gay but for some reason I just can't tell her. I'm not sure whether or not it's because I've not told many people... I said to my best friends that I wasn't straight at first and then said that I was gay so I'm thinking I've not said that I'm gay enough. I'm unsure why I can't tell my mum, not sure if it's because I haven't 100% accepted that I'm gay yet? I want to tell my mum because I want to tell other people. Im pretty sure I want others to know. Once my mum knows then I'll tell my dad.The advice I want is how? How do I tell my mum? I really want to, I just can't bring my self to tell her. I'm sure her response will be great because of the person she is but I just can't say that I'm gay to her? What can I do? How can I say it? It's making me loose sleep at night trying to think about how to say it. Typing this out helps me inside but I still find coming out so bloody difficult. I want to tell her soon because I'm starting to get fed up of people asking me when am I getting a girl friend ect. Because I know I'm into guys!Feel free to ask me anything but I just need help with coming out to my mum...