Hello Friend, thanks for reaching out here for help. I can understand your suitation. Yes, it hurt when you can't express your feelings and if your loved ones doesn't understand your problem. If, I understand right, you become speechless only when you are anxious or does it happens even in normal situations. If it's on the first scenario, then the solution for your problem is to control your anxiety. Means you need to find why you get anxious and work on the actions to control it. You may seek a help of professional psychology counselor to further evaluate.
Next Steps
Suggest you go for a counseling locally or can reach me online.