I mostly ride solo myself but started out riding with a partner. I do like group rides, just not all the time. Your skills will progress much faster if you ride with people better than you. Like Mongoose said, try to hook up with people on Singletracks that live in your area to ride with when possible or try to make friends with people out on the trails. I’ve had many people ask me if they could tag along and I had no problem with it, I enjoyed the company. Once you get familiar with the trail you won’t mind as much to ride solo if you have no riding buddy. If you absolutely can’t find a riding buddy, just go for it but know your limits.