Well, my home life hasn't ever helped. I've never had my parents there actively *supporting* me. They've just kindof existed in the background, saying if I need them, they exist. Other than that though, they never tried to become a part of my life when I was a little kid, so I lost a lot of motivation there.
Last trimester I feel behind in mathematics because I missed a single day (only day, keep in mind), and never asked about it. That was my fault, and I know, understand and admit it. However prior to that, it's normally depression that hits. Something causes some depression, usually self-harm and such occurs, I block out the world for a little while, and then when I'm over it, I'm screwed over in all my classes so I simply never resume-caring about said classes.
Now lastly what I think causes a loss of motivation is that I don't ever push myself to do good. I simply ride through life as it happens, rather than try to succeed. For a long time I mistook this as school being too easy (though it could have been more difficult); I knew I *could* be one of those students who gets put into all advanced classes, but in most of them I never tried because I never felt pushed to actually try and *learn* from material I already knew. Don't get me wrong, I'm in upper level science (As a sophomore, I'm in Junior-Chemistry, looking at taking AP Bio next year), and mid-level mathematics, looking at advancing into higher-level (AP Calculus and Stats) next year.
Science and Mathematics have always given me a solid base to learn from, so those have never been an issue, except my lack of desire to do things after school (eg. homework or studying) because of the first two reasons mentioned. Literature/Engrish/Language Arts, however, has always taught the same material, just with added complication, over and over again. That's why I felt a "lack of difficulty"; I looked past the 'added complication' mentioned.
Anyways, I'm looking at actually *working* towards getting put into Honors Lit next year, so I can *mayyyyyybee* take AP Literature my Senior year. After school today I met with my Lit teacher, and she agreed that I have the ability to be in honors lit, I simply need to do the work in normal lit this year. Which I'm resolving to do.