What do i do about my girlfriends over protective parents?

ok, im 15 and my girlfriends 14 we have alot in common were pretty much (misfits) and her and i have been through alot together. when i first met her i wasnted interested but when i got to know her i fell in love. you know all was well for a while since me and her just got out of bad relationships with real f**k ups we were kinda lookin for something serious so i took a jump into something all guys kinda fear, i met her parents i slipped a little and kinda gave them the wrong impresion but than they got to know me and they they started to like me (or so i thought) but you know after 3 months of dating they started acting wierd and trying to get us further apart from each other (thats were they messed up) instead of letting time take its toll and see if we got sick of each other they pushed us even closer together with and adition of alot of arguments but whatever were getting through it so just when things were starting to clear up after we have been together for alomost 5 months they say she cant date until shes (16) thats a year and a half away. i talked to my girlfriend about this and sugested that we break up(i really really didnt want to) the thing was i just dont want her having to face any troubles with all this and she got really mad and said no she doesnt want that she wants me and she doesnt care and she pretty much made it clear that she still is in love with me and wants to be together but we still have a problem we cant see eachother. i mean i really miss her i still get to see her in school in lunch and in the hallways and i get to walk her home only because she has no other way to get home at the end of the day. ok im a rational person people come to me for advice because not to sound full of myself of full of s**t i most likely know what to do or have a basic idea for there issues so when i say that we are in love i mean it im not just a teen in the moment i plan to grow old with her she is the only thing i really need to be happy. but her parents are really trying to screw this up also we cant talk on the phone either (i know) bummer huh... anyways i love her u know the last conversation we had i broke down into her arms and she did the same and we cried. the first thing she said was pretty reasuring she said we can do this. you know the hard part in that is the year and a half issue but i love her and i think that we can make it. also just a little extra info her parents are blaming me that she doesnt have to many friends and say im making her do bad in school cause shes late for cl alot. ok i would understand that if A.i didnt walk her to all her cles and try to get her there on time and B.she doesnt talk much to other people or try to make friends cause she just isnt social it was a pain ith teh a** for me to become her friend at first because of this issue. and also all her old friends did drugs so she ditched the crowd cause she didnt want any part of it. so is bs whats goin on. also i already did the talk to her father thing (didnt work) all he said was i cant be with her anymore. anyways i love her so much. and i really need someones advice on this please help me out and give me advice on how to get through this and let her know im in this for the long run. any advice would be apriciated.