How soon after meeting someone is it 'acceptable' to get married?

I've been with my SO for almost six months now, and we BOTH feel like we're ready to think about getting married. I already wear a promise ring and my boyfriend has recently hinted that he has got me an engagement ring, and we're moving in together in a few months. I'm just a little worried about what my family will think of us getting engaged/married so soon😔
Any advice? 

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