Hi. I had similar when i was growing up.

Your sibling can do what he wants. You might feel he's wasting his time/talent/etc but by stressing over it you end up doing the exact same.

Your family does what it does, you're not a magic-fix-it man. Don't make it out that you're failing or anything. Go do your thing outside of the depressing place. Even if that's your room with the door shut amd headphones on.

If your connection has the drive and makes the effort to talk to you even while they struggle through it. You put on that brave face and you struggle just as hard. They are just as aware of what you're going through as the reverse.

Once the talking stops, and it will eventually. The connection is as vivid and anchored as you want it to be. Remember the good things rather than the pain, or you'll only remember the pain and feel emotions influenced by that.

Friends being distracted is actually probably more you related than you might realise. If all you do is ask what they're doing tomorrow/this weekend. Then yeah it'll be hard for them to make time or fit you in. Find out when they have days off work, or aren't playing sport. Make time way more in advance than when you used too. Also find stuff that you can do on your own that allows you to meet other people.