I feel your pain my friend.
Similar story to you and in school in the UK I felt like a lone person wandering around a pride of lions on a daily basis. Would have loved to have gone on to uni but even back then in the 70s that was a big no-no.
It is difficult when other siblings are still in, and you are out. Because you try not to get angry with them when you're angry with the WT Society even when your siblings spout their JW mumbo-jumbo to you. Smile, nod, ignore.
It took me a long time to accumulate new friends who are not JWs. We can talk about everything from politics to mental health to celebrations. It does not totally wipe out the feelings you describe, but most of the time I find that I don't even think about the JW part of my life anymore.
You will move on and you will be happier for it.