Battling Judgement.

I am 18, he is 24. We have been together for only 3 months. Are secretly engaged behind our families backs.... I don't like hiding it from my family, but I am overall afraid to approach them on it. Also I might be pregnant........ They love him. I know I am probably gonna get a lot of shit from anyone being 18, but I have been through a lot in my life to be so young so I had to grow up quick. Which meant for me that guys my age are complete idiots in my eyes. I love the man I am with now and our age difference hasn't affected us until this situatuon. He is kind and sweet. He actually cares about my wellbeing and being the best man he can be and reminds me that I am his everything everyday. He is a hardworker. When you know, you know. Clearly he knows himself. I just need advice on how to tell my family all of this. Please help?