<human>: Condense the text into a few key points

Me and my GF have been dating for 2 years. There are a couple of things that, together, make a bit a complex problem:

Me and my girlfriend met while I was in undergrad and she was on holiday where I'm from. We dated for 3/4 of a year before she had to go back to her country. She was taking interviews to work as a stewardess so conveniently the plan was for her to visit me while she was working. 

I then received my medschool offer and my time in university got extended for another 4 years. Around the same time, she was disqualified from interviews because her eyesight was just below the margin to work on aircraft. I visited her at our half way mark and we haven't met again since apart from Skype. 

Since we are 5 years apart, I feel a bit hesitant about getting married so young but I also understand that some women might not want to get married that late. We decided that after med school would be a good time. This wasn't a big deal until we found we had no way of seeing each other frequently. She suggested that we get married earlier so we could stay together. 

To be honest, she's really someone I could spend my life with, but I don't know if I'm happy getting married on those terms. These days she's been pushing the relationship and keeps suggesting we get married earlier and earlier. My lack of compliance and hesitation has deteriorated our relationship a bit and we fight more often. Sometimes she gives me pseudo ultimatums that give me a lot of stress.

I've worked really hard to be where I am, and the stresses of someone pushing a committed relationship in my face and study have really made me depressed and angry.

I'm not sure what to think or do.

Any discussion would be great.
<bot>: 5 year age gap, long distance, confused about marriage, pushing towards marriage and figuring this problem out has driven me into the ground.