In much of the US there is a sad trend. Catholics tend to be isolationists.
Catholic families don’t socialize with other Catholic families.
Catholics don’t tend to send their kids to Catholic schools, and the Catholic schools in order to survive are filled with non-Catholic students.
Parish RE is a drop off class with no social component, parents drop off and pick up but they don’t socialize with each other. RE is also sparsely attended in “non sacramental” years.
Confirmation is for teenagers, it is made into such a hoop jumping contest that teens and parents are completely turned off and cannot WAIT until it is over. Catechists have some sort of crazed idea that everyone in Confirmation prep is a heathen and they must drill a lifetime of catechesis and rules into those kids in their last chance.
After Confirmation mass those teens scatter to the wind, they may go to Mass if mom and dad force the issue but they have such a bad taste in their mouth from the Conf Prep that the last thing they want to do is to get involved with the parish or do their high school volunteering at any Catholic thing.
Then, when young adults think about marriage we wonder why they don’t date other Catholics. Heck, they have barely met another let alone have a Catholic social peer group.
Get involved with your parish more than just Sunday Mass. Volunteer, go to social events, meet people who attend the other Masses. Go to social events at other parishes, at the Diocese. Instead of a vacation in Cabo this year, attend the NCSC Conference http://www.nationalcatholicsingles.com/ or a SEEK Conference https://focusoncampus.org/seek2017-san-antonio In college, join Newman Center, FOCUS, or in Canada there is https://cco.ca/
Join Catholic professional groups, start Theology on Tap in your town or host a MTG game night at the parish hall, book club at the parish library.
There are other Catholics out there.