No I think that's perfectly normal,there's a lot of talk now about not trying to fill every single minute of the day for our DC and I think it's true.
It was very different when I was growing up,there were'nt all the toddler groups,messy play,toddler tumble groups ect but I never missed out,I've never struggled to make friends as a child or an adult.
If anything I think it helped the generation I grew up in,we all learnt how to amuse ourselves,we learnt how to use our imaginations,as children we learnt a lot about ourselves and I think that helped with future friendships because we were happy and confident in ourselves and with our own company and I think that helped draw other people to us and made it easier to make friends.
When I had younger children at home I made friends with some of the women I went to a Toddler group with and a messy play group and I'd see them twice a week at those groups,now and again I'd have a friend who didn't go to those groups come round or I'd go to they're house.
Now my 5DC are older(my youngest is 8)I don't see my friends quite as much but when I do see them it tends to be for longer,sometimes we'll go out for lunch and go shopping,other times we'll all go out for dinner together(me,my DH our 5DC and my friends and they're husbands and DC)other times we'll visit each other's homes and watch movies and get a take away or when the weathers nice we'll have a BBQ,we tend to celebrate birthdays of the DC and the adults birthdays together as well.
I think socialising every single day for me would be exhausting,I love my friends and I know they love me but I think having a bit of space is a good thing and besides if you have a bit of space you have more to talk about when you do catch up with each other. 