wake up when my alarm clock goes off

I have always had a horrible sleeping schedule, but now that it’s slightly normal I am still unable to wake up on time. I was better at it last semester when my room mate was still sleeping in the room, but now that I have a room mate who gets up before I do I sometimes snooz for a hour. It’s kind of a problem because two days of the week I have a 7 am shift at work, and I always feel better after waking up earlier…I just don’t end up doing it unless obligated.