I just had the most inspirational and excited burst of creativity and my bf totally killed it

I wanted to create a weight loss blog that tracks my diet/exercise habits on my journey to lose 20lbs! I thought it'd be fun and positive, and really keep me accountable, like "are you sure you want that candy bar today Sarah? You're going to have to write it down!" haha. Anyway, my boyfriend thinks it's a terrible idea (because I said I was going to share it on facebook). He said people would make fun of me behind my back and when I found out about it I'd be really upset. I have NO idea why he would say that to me! I would never make fun of someone, especially a friend, for doing something to help change themselves for the better. I would want to motivate and congratulate! But he thinks it's something negative, doesn't see the point, and thinks it's only another way for me to "publicly air my dirty laundry". Idk is he right? Is this a terrible idea? Or am I right in thinking I should do this, if I want to? He said "Idk maybe it's just a generation thing but I think it's stupid" (he's 8 years older than me and has a facebook profile but NEVER posts on it, I mean never. He hates fb). Idk what to do. I was so excited and amped up about it by now I'm not anymore He said things like "Why can't you do this for YOURSELF and keep a private journal. Why do you want to share everything with everyone all the time!" And IDK, I JUST DO. I'm an open person and I'd like to share my journey with my friends. If I'm successful hopefully it'll inspire other people to get motivated to lose weight for themselves too! What do you guys think?
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I've been diagnosed with:
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