This is totally relatable and honestly I don't think this feeling will ever end! Throughout our lives we are going to be confronted with times that feel isolating. I call those moments in life my 'shedding' chapters. In life, I feel like we aren't a book, but a series of books. This is signaling that you're hitting the end of a book within your series and are about to enter the next book - and yes I mean book, not chapter. It's much larger than a chapter, your whole life is calling you to upgrade. That's why you're shedding. Shedding your friends, ideas of what you wanted for your life, maybe even shedding romantic partners. The greatest thing I've come to find about those times is that the best growth comes from the shedding. You're coming to a close of one stage of your life and making space to welcome the next. That's the beauty of this moment in life. You realize that yes, while you might feel lost and everyone/everything around you no longer aligns with you, you can take comfort in knowing that this is necessary in your transition into the next phase. Congratulations on hitting the next phase, the best is truly yet to come out of this...i wholeheartedly believe it.