again, poking my nose in here, but if you are very young, it might be a good thing you can't sort all ths out at the moment. the things one wants as a teenager are not always the same things one wants as a person in their 20's etc. once you are married, that is it, it's not a decision that is easily reversed without a lot of heartache and financial loss. perhaps give the relationship some time and see how it develops before deciding to get married. Applying for a petition/visa costs moneymoney, so if you dont have much this might not be the ideal solution either. i know its easy for older people like myself to say "give it time" but the reason people tell you this is because they are giving you the benefit of their experience.
in my opinion, starting off a married life by living with your mum and dad is not an ideal start. it might be better for both of you to work and getsome money so you have your own place - perhaps you could work in italy?
You are making t sound like your relationship wont survive a split in location for the both of you? being married rather than bf/gf wont prevent a relationship falling apart, "grately suffering" (sic) or ending, it will just make it more expensive and messy if it does