Today I was so cold I was shaking and so tired I could barley keep my head up in cl why is that?

Everyone else around me was fine.I was shaking all day I was so cold I am always like this though.I was wearing jeans with a cami with a short sleeve shirt and a sweater but I was still shaking.and I could barley make it in my cles like I felt dizzy and could barley make it to them.and whenever I touch cold water it's goes to my heart and start shaking because of the cold.what's wrong with me?ive also gone to the beach in sweatpants and a hoodie in 90 degree humid weather.and no effect at all.