So ive been with my boyfriend 13months?

i eat at his, if its just us eating like we'll have pizza and stuff, and ive eaten with his parents like twice but he wants me to eat round theirs and i get really anxious like ah i've got to eat round the table with his parents, and tomrrow he asked me out for a meal for some old lady i dont even know and his mum and dad and a load of other people and i said no, and now he's got the ump cos i always say no, i've explained thats im mega self concious i get really nervous, and anxious and im just not that confident, and hes like when ever i say something your like no, which is a lie cos i go out with him to places and that but i prefer it when its just us then his parents, he comes to things when i ask but he is more of a confident person and stuff, idk what to do, its like im always in the wrong because im self concious.. :(