The older I get, the smaller my circle becomes and I'm struggling with that

Mid 30s, estranged from most of my family except one relative who i have a good relationship with. I have a partner who I would consider to be my best friend. Other than a couple people at work I get on with and occasionally grab a drink with, I have no friends left. All of the friends I did have, turned out not to be very good friends In one way or another. Although I am glad I'm no longer 'friends' with these people, I do sometimes get lonely and the self-pity parade starts up now and again. Especially when I have life milestones or need to confide in someone. I'm conscious of not expecting my partner to meet all of these needs. Sure I could make new friends but at my age and the experience I've had of 'friends' in the past, just doesn't seem worth the effort.