Just casually slip it out in the middle of a conversation. Sort of like: "Y'know, I'd l’amour to be an actress". Trust me, just say it, then it's over and done with. Better than hiding your dreams from the people who care about toi most.
I'm sure it will be fine! Everyone I know knows that I've wanted to be an actress all my life, and I know that some of them probably don't think I can make it. But they've never seen me act, and I'm determined that I'm not going to let someone else's opinion getting in the way of my dream.
I know it's harder to say than people make out it is, but honestly, blurt it out as soon as possible, otherwise the plus you'll worry, then the harder it will be to say.
I wanna be an actress too :D My family did laugh at me, plus concerned though. They think I'll eventually get into drugs and stuff but hey, believe in yourself, yeah? :D When you're about to give up, remember why toi started. (: