Does anyone else feel guilty for wanting alone time?

I genuinely love my kids (3yo twins) but sometimes I just need to NOT be around anyone. I'll go sit in my car in the driveway for 20 mins and my brain finally quiets down. My wife thinks I'm avoiding the kids but honestly it's the opposite—I need that reset so I can actually be present with them instead of just... existing in frustration. Feeling weirdly guilty about it though like I should be thrilled to spend every second with them. Real talk: is this normal or am I selfish?