Hey, I'm almost 26 and literally listening to Dear Evan Hansen right now! (Requiem, to be specific). It's not childish of you to be struggling. I'm in the same situation. I am nowhere near getting married or having kids. I waste my days agonizing over really stupid stuff, yet it doesn't feel stupid in my head, it feels like the worst things in the world because I catastrophize and obsess about the outcome. You can share your story with me, I won't judge! I went to a doctor for the first time recently and just burst into tears as soon as I sat down. I hadn't even met that doctor before, yet it just came pouring out. It hasn't actually changed anything though. I still feel the same way. Anyway, my point is you are NOT too old to be feeling this way. If anything, I actually feel worse the older I get because nothing is changing and things are just getting worse as I get older and achieve less. If you do want to talk, feel free to PM me or just reply to this. I hope you feel at least a teeny bit better.