5 years in love, she doesn't give me enough priority, no sex.

I’m 22 years old, a computer engineer undergraduate. I’ve been with her for almost 5 years now, who is a 22 years old medical student. I’m often very open with my feelings. She is a little mystery type. But together we have so fun.
At the beginning of the relationship, we both were studying for Advance level exams. So after our parents got to know, they were furious. Typical Asian right ;) but after she was selected to the universities, I got to meet her family. They are awesome! Really warm, unlike my family which doesn’t express a lot of affection to each other.
At the beginning, almost always I had to force her to romantic or erotic things, because she doesn’t want to do anything other than her parents say to her. I know forcing to do anything is not good, but believe or not, we have been only to second base for the 5 years with each other. She loves those moments, but doesn’t return the favor.
We have had some alone moments outside, but she’s really stressed at that moments because her conscience. So I can’t really enjoy the time with her alone. We have been to cinemas several times, and have went shopping too. But we have never been to a beach or a park where we can talk peacefully.
She is so attached to her family, I feel like an stranger to her sometimes, she is so busy lately because of her medical studies, she got really good boy & girlfriends. She is really cheerful around people. But she gives me a little. If I ask her to meet me outside, she says to come to her home. So I go to her house sometimes. We have some alone time to chat upstairs, we be a little naughty, that’s all. She won’t sacrifice anything from her timetable for me, which I get, she is may be so stressed about her medical studies. But she has a boyfriend, waiting for her to come to me, talk to me without thinking of anything else.
I do and I will sacrifice anything to meet & make her happy, and I’m so disappointed of what I get from her. God I love her so much, so pretty, so sweet, but I feel like I’m far away in her priority list.
I talked about this with her all the time, sometimes we fight, but she’s not ready to go against her parents, until we get full permission. She’s going to be so busy after the medical school, training in a far hospital, and have to work hard. I try to convince her that this is the best time we can be together, but she’s like ‘deal with it’ :(