I was at a youth camp one summer that I enjoyed but when they played all the songs I just stood there and because I thought I was too cool for all of people's craziness. I've never liked dancing, I can't clap on beat, and jumping up and down just seemed pointless and a waste of energy. They played one song, Build Your Kingdom Here, and I got into it. I didn't worry about what others where doing or if jumping and clapping should make a difference in how you feel during songs. Jumping and enjoying that song made me have much more fun and reminded me that a lot of the time things that seem like a waste of time because you're too mature for them can actually bring you a lot of joy. I think I've said this before but joy is something I have a hard time with because I think I'm too mature for laughing at certain things or I don't see a reason to be joyful so I'm not. My point is don't be too cool or too mature for God and enjoying your time with Him. You can't experience joy if you're holding yourself back.