For one, I think it's a bit of insecurity and as a result neediness speaking. If she is dating you, she likes you and you should try hard to actually accept that. She has better things to do with her life and time than to just use you for weekend entertainment. In other words, don't self-sabotage.

For two, I don't think you are fully grasping her life and what she is doing even when you say that you do. You want attention that she literaly cannot give to you and quite frankly will never really be able to give. That's the downside of dating doctors and lawyers. So ask yourself very honestly if this is something that you can honestly handle. Residency is only going make things worse and even more tense and her time even more sparse. Once she gets done with all that, depending on what she does for a living her time will also be pretty busy with work and possibly unpredictable for the most part. Can you really handle that and can you trust and have enough confidence in your relationship to deal with that?