Hi,

your post titles, somewhat confusing ..however for you two its much better to get married.

which is the main problem for you.

you've got the girl, now get into her family as well.
I am not an expert in your culture, but I guess very few would be comfortable with seeing stranger one fine morining who's asking hand of their daughter.

you two know each other for past 3 years. Why not she introduced you in her family as a friend/collegue etc.

as someone said, you are too young to trust your very own feelings towards anything .. it'll change with time.

Trusting your feelings towards your friend, I'd suggest you to opt for the honorable way of getting married. That is be known to her family, Earn their respect, Win their favors, Become their groom of choice .. as so goes to the girl as to promote her feelings toward you in her family.

it'll take a while before everything would be set, and all left would be a formal ceremony,

good luck.

=

Holy Prophet Muhammad (Peace & Blessings Upon Him)
said : A woman may be married for four reasons:
for her property,
her status,
her beauty
and her religion,
so try to get one who is religious.
(understanding, Book 008, Number 3457)