It is tricky to get out and about, if he is happy to sleep in his pram, go out and take the feed ready for when he wakes.
With both my DS's, I used to do this. With my 2nd he had not choice really if he was asleep and I had to get in the car to go pick DS1 up from school, or I would walk with him in the prams.
I also used to leave him in the buggy if we got back and he was a asleep, wheel him into the house!
It's hard at this age, to establish a pattern, but the time between naps and feeds with start to lengthen and you will have a better pattern making it easier to get out.
Do try and get out, it's really important to have fresh air and meet up with people, even just for a walk, half and hour for a coffee.
People will turn up at all times due to their babies and no one bats an eye lid of someone comes half and hour after later, or whatever, don't stress about being on time.
Or invite people to you house then DS can stay asleep.
Well done and good luck it does get easier I promise!