My (25M) and my Girlfriend (26F) have sex almost every day. My Girlfriend sometimes wakes up when I wake up for work, and she asks me if I want to have sex before I leave so I usually say yes. This morning was different as we were having sex and I tried to make eye contact, but she was without expression on her face. I asked her if she enjoyed herself, and she said yes. I’ve been thinking about this all day, I can’t brush off the thought that she might not be satisfied with me. I feel as though she is forcing herself to have sex with me. Am I overthinking this?