There are two conflicting statements here...........
When I’m alone with my kids I’m happy
and
I feel so lonely all the time but then feel worse after meeting up with people
When I’m alone with my kids I’m happy there's absolutely nothing wrong with this. You're happy being with who you want to be with and don't need anyone else to make that happiness for you and I'm sure your children are happy being with you.
but I feel I’m stunting their development by not having social interactions - how old are your children?
I very much doubt you're stunting their development - children have plenty of time to develop relationships and social skills with others at nursery and at school.
You're developing strong relationship values with them now and that's a good thing - there's a lot of pressure nowadays to 'socialise' children and 'develop their skills', when in fact children can be quite happy developing relationship skills( if you want to put it in those terms) just within the family.
I feel so lonely all the time but then feel worse after meeting up with people Do you actually feel lonely, or do you feel that you should be meeting up with other people?
There's a big difference - childcare and societal expectations have changed so much over the last years because of the pressures that working parents face.
If you and your children are happy now then carry on, because your children aren't missing out in any way.
If you're not happy tho' for reasons other than the 'not really enjoying playdates with other parents' then that needs to be addressed ? x