how do you know when its the right time to get married?

I don't know how deep love you both have & whether you already have sex relations too b coz it is almost impossible for a young boy & a girl to live together for 4 years without having sex attaining orgasm, though rare exceptions do exist. If you both already have that experience, it is injustice for the partner by not marrying. If you both don't have experience of sex but want that to have, get married immediately. When both could live together peacefully without having any ripple in the living relationship, that means you can easily manage home affairs & understand each other well. That very quality is needed for a married couple. So, go ahead in the marriage process. What hesitation do you have preventing that ? I don't see anything wrong in that.

If you're willing to be with that person through very hard times and good ones. If you would stay with that person even though they may become ill or disabled and you would have to take care of them or vice versa. Are you financially ready? Are you responsible with your money and decision-making? Have you talked about children, religion, family, etc? Are you genuinely committed to this person for the right reasons? Are they good to you or disrespectful? Can you trust this person?

Those are some questions that are good to ask yourself. Also, many people see a pre-marital counselor or a priest/rabbi/imam (religious leader) to talk about marriage and discuss things to make sure you're ready. It's very helpful.

There's never really a set right time. It depends on the couple. If you both want it, shoot for it. If not then you talk about it. If not, maybe he'll get engaged with you and you guys see how that goes for a year or so :) Good luck.

If marriage is on his mind he will ask you. If marriage is only on your mind you are welcome to discuss it with him to kind of get a feel of his intentions but it is such a huge step that you cannot rush it. Do you love him? Well then be happy!