How do you deal with an opponent who won’t react to your feints?

For reference, I’m a real tall skinny dude (6’1/185 cm, 150 pounds/68 kg) and I do well in sparring sessions where I can feint and land big kicks and long punches. However, I deal with a sparring partner regularly who doesn’t react on my feints, and just pressures me to where I can’t fight close. How am I supposed to establish respect and make him react on my feints?