Who can I discuss ideas/ projects with?

You can start by sharing what you would like to build, what you've built before, etc.

Along these lines, is there a discord server for HN? Sometimes the free form conversations could be a nice change of pace to the more serious and topic based ones.

There's a bunch of Slack communities for founders, entrepeneurs, etc. Just search for "slack community entrepeneurs" and you'll find a few compiled lists.

I've been part of 1 or 2, and whilst you can find people to chat with there, these communitites are often owned and run by someone who wants to make money out of you so expect invites to webinars, promos, etc...

Discord!

Seriously, there are loads of communities of super motivated people (many of them young) in the exact same position as you.

Some of the older folks on HN have a distaste for Discord and don’t see it as being a place for serious discussions, but I assure you, among the teenagers there are also super smart, always-online engineers and builders absolutely chomping at the bit to start talking projects.

I’m in love with personal projects, either from me or someone else.

You’re welcome to email me at the email in my profile if you have something you want to review or just want to bounce some ideas off someone

YC startup school might be something to look into: https://www.startupschool.org/