Well, Yes your heart function ( ejection fraction) is decreased. But it's mild impairment. You have to continue the prescribed medication regularly. Your ECG is also showing some abnormalities ( VPCs). Your medical treatment would help you in that too. I think you can go ahead with your life and marriage. Have healthy diet and physically active as per your capacity. Regular follow up with cardiologist and echo assessment. Your left ventricular function may also improve as you are young and your disease is post infection. Hope for the best. Get well soon..