Is my life over now? can i still change?

just finished semester 1 in uni and i got my results back and realised that i failed all my papers. the 2 i thought i did alright in i still failed with a D. i feel so stupid and now i feel so depressed. is it too late to change? if i start studying hard the next semester? the science department said that even if you fail you can still continue but you will just be a semester behind. i feel so dumb...... i really want to change. sometimes i feel like things like facebook and the internet are really getting in the way. When i try to study i can't concentrate for long and end up falling asleep. Please give me some advice in how to study please........