Should I worry about very reserved son?

[Tereo]

My 15 year old son has been very reserved since he was about 3. I can remember the first time I noticed it was shortly after his sister was born. Before that he was a chatty little toddler.
We have spent years trying to bring him 'out of himself' with activities and 1to 1 time and communicate more.

He is very close to his older brother who talks loads and tells us everything. Older brother says he doesn't open up to him either tho.

I suppose I worry because the two very reserved boys I grew up with (reply in monosyllables, little facial expression) were possibly autistic and had mental health issues as adults.

However I don't think DS has any mental health problems, has good friends (who he can chat and joke with) , loves basketball and piano, is in a band. He s very clever (but does no study, think he's ADD like his older brother)

So should I back off and let him be him or is there anything we should be doing to encourage him to open up?

Thanks!

My son is the same he’s 19 now though he was diagnosed with ASD/ADHD last year he’s still very reserved has a few friend but doesn’t really need to see them or socialise , I’ve worried so much but he seems happy enough and not depressed .

Thanks so much for reply! Glad your DS is happy.
Yes my DS too seems happy enough too. Sometimes I wonder I'm such a blabber mouth maybe I am just imposing my personality on him?

But he definitely has that cautious, waste no words, little facial expression thing going on that I've noticed in some other boys through the years. He just doesn't seem to need to converse.

I just can't imagine how he's going to have a relationship with a woman or will he open up to her?

I just feel sad sometimes when I remember the chatty toddler... Was he traumatised by something or does personality emerge? (no obvious trauma in his life)

Yeah I do worry how he will be in a relationship but I guess that’s his business now , I do still worry but more at peace with things now , the rest of my kids are fairly outgoing so it’s nothing inflicted on him though I’m quite introverted myself .

I suppose it’s just his character. Reserved people are among us all!

If he laughs and chats with friends, plays a team sport, and plays in a band, I don’t think I’d be too worried. If he didn’t have friends and spent all his time online, that would be another story. From the sounds of things though he’s just a bit more reserved than the rest of the family?

Thanks all yes I think I need to just leave him be himself. And stop worrying!