What in the world have I gotten myself into

so basically there is this girl, amy, that i met about 1 year ago through some relations with my friends. my friend showed me a few pics and the like and i wasnt really "stricken" by them or anything. i txted her shortly after just becuz and we started a conversation. after awhile we decided to chat via skype. we only talked for about 30mins but in that short amount of time i felt something very strange to me that i never felt before. i still have no idea what it is i just cant explain it. i dont know a whole lot about her though as she has been away for most of the summer etc. Here are some things i do know: she plays basketball, she has the same taste in music that i do, she has an amazing personality and she is 2 grade levels below me(im a junior in HS). yea i wish i knew more but she is very confidential person. now we get to the long list of "problems" so to speak. she smokes (weed and cigarettes), she gets high off drugs, she inflicts self-harm(although she has been going through therapy and the like), and, unfortunately, lives about 1200 miles away from me. yes i know quite the problem. i have seeked advice in the past and was told to just drop her becuz it was a fruitless effort trying to get together with someone that far away expecially someone who does "terrible" things such as those i listed above. now i dont particularly care about her doing drugs or smoking becuz im just unbiased about that (though i would like to try and help her as she does want to quit). however i did agree that it was a bad idea so i gave up on her and didnt talk for months. i started to see other women but whenever i got close to them i kept thinking about amy and was never able to develop a relationship with anyone becuz of my feelings. they are just kinda stuck with her i guess. so i started talking with her again and now im at the same point i was at before: should i keep trying or give up? yes she lives far away but i will be leaving HS in a year or 2 so i could potentially move there if things get serious. but i REALLY dont want to waste my time with something that wont end well. but i cant get over her. ive never had the feeling i had when i talked to amy with any other girl ive ever met. is this some kind of sign or am i just stubborn? i honestly am lost at this point and would love some insight. thank you.