Hi... Welcome to healthcaremagic forum...
Yes, your triglycerides are higher than what it needs to be (normal cut of range is 150mg/dl). Based on American Heart Association, you are under risk to develop complications.
Triglycerides and cholesterol
levels can be rectified by simple changes in diet and lifestyle. And I concur with your doctor that modifying your diet - consuming low calorie and low fat diet; weight reducing physical exercises; avoiding unnecessary.
Medical drugs such as fibrates can be tried as adjuvant's to these changes. Since these drugs are to be used often for long term; some times lifelong and can induce side effects, these drugs need to started and monitored under guidance of your doctor.