Original post by Gold DInarIt's haraam in Islam to interact and free-mix with a non-mahram of the opposite gender outside of professional reasons. You cannot be "friends" with her either as it is haraam. Having a "crush" or attraction to the opposite gender is not haraam, it is from the natural desires of mankind, the opposite genders have been created by Allah(swt) like this and they are naturally attracted to each other. However, acting upon this in a haraam manner is haraam, and instead you should seek a halal means which is to go via a third person and ask for the sisters male mahram contact details(her brothers/father) or preferably her wali(which may be her father). You can arrange meetings then with her mahrams present.
Secondly, you should try to lower you gaze as this is what has caused you to fall into this situation of "infactuation". And in Islam, Love does not exist before marriage. Don't be a dayooth and waste your time and waste the sisters time, be a man and go to her brothers/father using the method I have explained and arrange meetings in the presense of her mahrams so you can get to know her, then you will know whether or not she is compatible and a good muslimah and suitable for marriage.
Thirdly, being in education still is not a barrier to marriage. Marriage in Islam is not the same as that of the western culture or the "desi" culture of having some sort of big wedding thing. Rather it is just to get the nikah contract signed so that you two become halal for each other according to the Sharia' of Allah(swt). You can then talk to the sister and do whatever you want as your interaction etc. is all halal as you are married to her. You can agree to stay with your parents and she can stay with her parents and after you have finished education, and have a job you can agree to then move in together. So this is the idea of marriage in Islam and in Islam it is encouraged to get married young. Sadly, it is the backward culture of many parents who are cultural and dont have much knowledge in islam so they make things hard as they thing you have to finish eduction get a job buy a house etc. to get married. You said you have an attachment to Islam which means you care about Al Islam, and you have some level of imaan and taqwa of Allah(swt), so do the correct thing, don't disobey Allah(swt). Don't turn your back on Allah, otherwise Allah will leave you and you are the one in need of Allah, and Allah is not in need of anyone.
I can personally also attest that this type of marriage works and I have seen many of examples of this working. I too also received a proposal actually whilst I was in sixth form from a sister. It all depends on whether your parents are cultural or Islamic. If they care more about Islam then it will be easier for you.