I think in a relationship of 1 year at 19 years of age would be generally too soon, only because I doubt you have reliable answers to (very non-romantic questions!) like:
- What are your attitudes towards finances? How will you manage shared finances as a couple/ cope with financial difficulty?
- What are your attitudes toward managing a household and how will you do this together as a couple?
- What will it be like living together independently from your families?
- How well do/will your careers work together?
- How well do you know and get along with one anothers' families?
- Will your relationship feel stagnant after a few years, and how will you manage this?
- Does this person have all of the qualities you will desire for the rest of your future?
- Etc
There might never be a 100% answer to some of these questions, and commitment is always a risk. But you have to ask yourself are you in a particularly bad position to know the answer some of these questions aged 19, still dependant on mum and dad(?), not knowing your future career(?), after only a year long relationship which I presume hasn't had an opportunity to experience stagnation/mundanity/financial obstacles/living together etc?
Then again all 19 year-olds, and all relationships are unique. I've made a fair few assumptions which might not be true.
Some individuals' have successful relationships or even marriages from this age. But is that something they could have known, or just good fortune?
An engagement is less of a commitment than marriage - but it will still be embarassing and painful (and may affect the way you view future engagements) to break it off if the worst happens.