Loud sneezing or making sounds while eating makes me go mad. What to do in such situations without making anyone feel embarrassed?

Always carry earphones, simply put in your earphones if you can when you're in that situation. If not, politely remove yourself from the situation and go back when you have calmed down

Concentrate on your own meal, if this doesn't work you can excuse yourself, go to the bathroom, take a few breaths. Maybe finish you're meal quickly and clear up, get busy to avoid getting worked up. The clattering will drown out the other sounds.

This phenomenon is actually incredibly common and is called 'Misophonia'. As your negative reactions to these sounds is completely out of your control, I would advise you to subtly remove yourself from the situation wherever possible. If this isn't an option and your distress is very obvious, it might be worth explaining your condition to the offending person.

If it was in a place you can avoid. the most easiest way is to leave the place. But if you had to stay, you can ask kindly for the person to not munch and anything else that bothers you, Explain to them that it makes you feel annoyed and mad so they can understand and feel less offended

sound sensitivity is a common thing. It can be incredibly frustrating to feel this annoyance, especially since many people wouldn't understand it. Breathing exercises and coping mechanisms help. Try continuing the 7 Cups journeys to find some. Feeling compulsion can leave you feeling very lonely, and make you feel like you are not understood, which I understand must hurt a lot. It is good to reach out for help. You are not alone feeling this way. If you know the person well enough, you can always explain the situation to them and kindly let them know, and make sure they understand that it is nothing personal to them.

This is completely understandable and expected. Feeling irritated by the sounds and noises means that the body is giving the signal that there is a belief inside that needs to be let go of, that prevents the inner peace from happening. Eckhart Tolle suggests to sit with it. Just like during meditation, if a dog barks, if a car speeds up - those are the noises that are outside of our control. Sitting with yourself, observing your own irritability and trying to figure out why this or that noise is irritating - is it the noise itself? is it the memory that the noise brings up? Once the noise is allowed by you to happen, it will be noticeably easier to just accept the existence of the noise.

I suppose it depends on who it is and the situation. If they're a friend, you could just tell them in a playful banter-y way. If it's someone in a more formal situation who you're close to, if you're comfortable, you might want to take them aside and talk to them. In other cases, you might just have to either move somewhere else or just try to manage it.

There are many people who are more sensitive to specific sounds (misphonia). As it is often difficult to avoid either, learn some relaxation techniques for when you find yourself getting irritated by specific sounds. There are support groups as well. Blocking the sound and avoiding are obviously the first line of defense, but not always feasible.

Maybe suggest nicely that they could maybe stop chewing so loudly and explain to them how it makes you feel

I sneeze way to much in class, as in if you combined all of the sneezes of everyone in my class combined I would still have more sneezes. Try dabbing, if you are able to laugh too you can make a joke out of it. In social situations I like to try the perspective of other people and in all reality I don't really mind when others sneeze, if people hate me because I sneeze a lot it's their loss.