First of all don't feel bad. When people suggest stuff like that they aren't really thinking of you, they just don't want to look bad for not inviting you. Don't feel like you have to go if you don't want to, and if you do there are frozen pizzas you can get that are gluten/dairy free and lots of sweet treats. If you bring some to share, maybe more people will like those types of foods. I have "converted" friends and family to enjoying dairy free desserts by bringing them so some of them being some too now just because it's yummy :)

I would rather take my own food and join others. There are several gluten free options and /or a salad and cookie for dessert. This will iensure that you eat properly.

It's hard at first but just ask the host if it would be helpful / convenient to take your own gf pizza and cake along. They are always relieved. Then enjoy! 😁

You are to hard on yourself AndiLiz..I understand what your feeling because I felt the same way for a long time and end up with depression because of my fear of going to social event because my fear of not eating and have to explain myself all the time.Please don’t isolate yourself ,try to fight your fear.Enjoy the company of friends ,forget about what your going to eat or not .I know it’s hard ,I try everyday to push away those feelings of feeling guilty about something who is out of my control.
Hope I help a little

take your own safe food. or dont go, or go for the company. my allergic kids wouldnt blink an eye at either not eating or bringing their own, They would sit with others eating with a drink . my son would simply pop to macdonalds as they have safe food for him, and daughter would eat later.