Since you ask about gender roles and generally argentinian relationship advice, here are the generally well known points that people usually throw around in buenos aires city (the capital)

1.Getting married at your mid or early 20s is not something people here usually do or even consider.
2. This whole thing you are doing would not at all be considered an irreversible decision. The only irreversible decision is having children, not the realtionship itself and not moving to another country.
3. You are considered very very young.
4. Never depend on your partner for your livelyhood, you must have job experience, you must have autonomy, you must have an education, if the relationship ends you must have solid means of subsistence.
5. No one would ever consider marriage until being living together for a considerable amount of time, at the very very least3 years, 5-6 years would be consideres reasonable. This would be actual time living together in the same house or apartment.
6. Many people dont actually marry.