What confines the fusion reaction and prevents the star to blow out due to the outward pressure from the gas pressure and the radiation pressure powered by the

What confines the fusion reaction and prevents the star to blow out due to the outward pressure from the gas pressure and the radiation pressure powered by the fusion reaction? Basically why isn't a star a giant thermonuclear bomb? This is gravity, yes no energy is technically extracted, but you can no more have fusion in stars without the constant pull of gravity which confines the fusion reaction in the same manner as magnetic confinement fields achieve the same effect on earth.