Unless you've been shielding no-one has been 'trapped indoors for months'. We've thoroughly explored all of the local parks and nature reserves from our city centre location. Loads of lovely places to walk to and for the last month it's been allowable to drive to places a little further away. We've still stuck with quiet, non-tourist locations though to avoid other people.
With respect, whether people feel as if they have been trapped indoors for months probably depends a lot on where they live, the sort of housing they live in and whether they have access to their own transport. I live in a small flat with no outside space in a city. I don't have a car and have nowhere to store a bike, so have been limited to travelling only as far as I can walk, which means I haven't left the city, or even been to many other areas of it. There are no nature reserves close enough to walk to. My closest park is very small and not particularly interesting or lovely. Most of my walks have been around the local residential streets, which at first was interesting as I hadn't explored them before, but it quickly got stale and I now feel I am aimlessly and pointlessly wandering the streets. So I do feel like I am trapped, perhaps not indoors, but certainly in the 2 or 3 mile radius from my home.
That said, despite feeling trapped, I have no desire to go to a beach in sweltering weather and with thousands of others. All I want to be able to do is get on a train and visit my close friends. That's what I feel I am missing out on - as others drive to meet people in their gardens, I can't see most of my friends because I can't get to them.