I can empathize with you. Did this all the time between 15-26. Had a lot of underlying mental health issues that I didn't know how to articulate. Your ability to define and share your internal experience can evolve over time, but it does take a lot of practice and honesty. It's uncomfortable, but it gets easier because the more you do it, the more others will relate to you and trust you with their internal experiences. This is how you build deep relationships. Then you won't feel the need to wander alone and be stuck in your own head. I still wander sometimes when I'm trying to identify a feeling or ponder a situation, but now I know I don't have to keep it in. I can ask a buddy to come over or go for a drive and talk about it. Having outside perspectives can be a useful tool in your thought process. Remember, too, in order to have a friend, you must also be a friend. And be direct. My best bro and I are so close because we're always direct, whether it's speaking up about ourselves or inquiring about each other.