Why can't I get up early and sometimes don't hear my alarm?

I'm a complete nightowl and I start College and have classes at 7:30 and have no idea how I'm going to get up cause it's hard for me to hear my alarm. I sleep deep and am up all night doing my homework. Would there be somethign wrong with me? It's the loudest alarm clock I've ever heard and it don't work I just sleep through. Need advice soon because I can't be late all the time should I go to the doctor or is this just something I need to change on my own cause my mind is wide awake all night long
Why can't I get up early and sometimes don't hear my alarm?
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