Getting married and/or having kids is a terrible way to try to address existential boredom. A spouse will not give your life purpose. Kids probably won't either, and if it turns out that you are unhappy and resentful after your failed attempt to solve your boredom, you can easily screw up your kids' lives (and screw up your own life, because kids are not a short-term commitment).
Have kids because you want them. Not because you think they'll give your life purpose.
> Getting married and/or having kids is a terrible way to try to address existential boredom.
Starting or growing a family is a terrible way to solve problems.
If interaction with kids seems like a good use of time, start by volunteering with mentoring organizations like Big Brother/Big Sister or Boys and Girls Clubs. Or help out with the kids programs at church/temple/synagogue if you're into organized religion.
If that pans out well, consider babysitting for foster families. Foster parents do incredible amounts of good for society and get run into the ground in the process. It seems simple, but giving them a night off here and there is a huge help.
If that goes well, then maybe consider adopting or starting a family. At any rate, there are a lot of young people out there that could use positive (especially male!) role models.
Have kids because you want them. Not because you think they'll give your life purpose.