It might be worth introducing your parents to BDEC as they can do this at home. It would help them to understand the importance of carb counting and help you.
If they are still not going to allow you to weigh the pasta, you will need to test before and 2 hours after the meal to determine the impact on your blood sugar, and work out how to adjust your insulin. You should also be testing before your basal to confirm you are having the right amount.
While it saddens me to say it, you may need to sit down with your parents and have a very blunt conversation along the lines of you need their help to make sure you stay well and healthy and that their current approach is one that could result in you facing more time on hospital and making you extremely ill.