The “break” dilemma at my office

My workplace allows you to take a 30 minute, unpaid lunch break. That's the only break you're allowed to take. Anything under 20 minutes will be paid. However, nobody usually takes this break and just keeps working, and they eat at their desks. I'm too uncomfortable to take a break when no one else does, not even the manager. I also hate to say this, but I'd rather just work through the break and keep getting paid. Anyone else experience this at their office?