Last night I asked for prayers, for I was going to attend my first Catholic Mass in the morning. I am back from Mass now, and I thought I might share my thoughts, as well as questions (questions and comments that may seem silly, I’m not sure)
I was worried that I would be the youngest person there (17 in a month

) but there were many young families and I did spot a few teenagers. It overall seemed very mixed rather than just one age group.
The people seemed welcoming, but nobody actually spoke to me directly. I felt more out of place because I could see the community was rather tight knit. Everyone was quiet before the service, and when it ended everyone quickly exited the sanctuary area and mingled a bit. They all seemed to have their own circles.
I have belonged to about ten parishes in my lifetime. One thing I have found and can relate to in your words, is that Catholic Parishioners tend to seem standoffish and gravitate to their own circles. However, I have found everywhere that all you have to do is say hello, or make a comment about a piece of jewelry someone is wearing, or if at a parish hall where refreshments are served (coffee and donuts in many parishes), you can sit at a table alone, and just say hello and the conversation starts. I have so many friends I have made just by doing what I’ve just suggested. In fact my best friends with whom I share Thanksgiving, Christmas, summer cookouts, Easter egg hunts are all people whom I’ve met at church, and just developed a friendship by saying hello.
To have friends, be one. I think so many people are in your position. Some of my closest friends have said that they felt the same way as you did, and were so glad when I said hello.
Try it
Shalom