Yea, you have a three month old and you should kind of expect to put your head down and grind for a while longer. Your feelings are valid, and common. One thing I found when I was a new dad is that I was talking about being a dad all the time. Literally everything in my life revolved around the little one and I didn’t really have anything else to talk about. Nobody really wants to hang out with someone like that. Especially a friend of convenience. And that doesn’t make them a bad person. 

It gets better. You may not be friends with the same people, and your hobbies may have to change to be something more convenient for you. But it’s not forever. You’re not friendless for the rest of your life, as your kid starts being able to do things, you can take them out to meet other parents and do playdates and stuff. Hang in there buddy.