I'm sorry you're suffering right now. To echo what Morghana says, there isn't always something wrong with wanting attention, you are angry at yourself because you subconsciously know you want attention, for someone to recognise your pain and help you. Just to pick your brains a bit, are you hoping that somebody may notice? Perhaps a teacher at school, a friend, maybe your parents?

When I was in Year 11 at school aged 16, I started self-harming (stopped in February 2011), mostly I didn't do it for attention (I NEVER wanted people like my parents to find out or non-close friends or other teachers), but I started cutting myself in school to try and get the attention of this teacher I liked because I had imagined she could help me.. she was my old RS teacher in Year 8 and had known a lot about things like suicide and stuff in life. Once I cut myself too deep in my hand and I actually caught her attention by accident and was marched to the medical room in reception to get stitched up, i wouldn't answer why I did it. As it comes across she didn't think she could help me, she reported it to my head of year who (attempted to) have me referred to CAMHS. I felt really ashamed and embarrassed of cutting myself to get her attention, but the point of the story is I guess is that it's a subconscious cry for help sometimes I'd like to think with 3 years of retrospect that I'd have actually went and talked to her rather than did that. Sometimes it's hard to find that voice.

As for school, well I echo the sentiments, but unfortunately I've found the real world just as daunting, just without the structure and meaningfulness, but I'm not a good example, since I'm unemployed atm.. I hope that you sort your problems out. I'm not sure what advice to give exactly since I've been in a similar situation (possibly).