Are we pressing too much at U8?

The chasing is not the problem by itself. The question is whether they are learning anything beyond “run at the ball”. At U8 I would keep the detail very light. The first player can go and affect the ball, but can the others get back into the game and help? If the first press gets beaten, what happens next? Small 3v3 or 4v4 games are enough to work on that. You do not need pressing triggers and team schemes. I’d also be careful how much you celebrate goals that come from the keeper being rushed into a mistake. If all the praise is about winning it high and scoring, the players quickly learn that constant chasing is what the adults value. Keep the energy. Just start helping them notice that good defending can also mean slowing an attack down and helping a teammate.