(((((((jrae)))))))))))
Boy do I know how you feel. I have one sister a year younger, and one 5 yrs younger....
The older one will graduate this next year. I've been in university for FIVE yrs for a 3 yr degree. She's graduating in 4 yrs with a 4 yr degree. Ouch. And I'll be here longer, because I want to do another BA afterwards. She'll probably wind up doing her Masters or something...

Oh, and my littlest sister will actually BE in university when I'm still here.
And that really sucks, but you do things at your own pace... it sometimes feel like the end of the world, but it really isn't.
Take care of yourself, first and foremost.