Please someone I need advice

My 2 year old son is everything to me. The best little boy ever and I love him more than anything. I seem to be getting very frustrated and angry when he messes about at meal times, it’s not all the time but when he does do it it really frustrates me and I feel myself boiling inside which sounds ridiculous. I feel like such a bad mum for shouting at him but when he is storing the food in his cheeks and not swallowing it really gets to me. Sometimes I’m sitting for over an hour and he just keeps it all in his cheeks if not spits it out. This is food he likes and asks for but he just does it somethings and I need advice on how to deal with it because I feel terribly guilty for getting frustrated