I cant relate to anyone, what should i do ?

Everyone is so diffrent, i dont understand it. Im in the 7th grade and the only thing people worry about is looks and popularity its pathetic. Sometimes i just take a second and breath and realise i amm slowly following in everyone elses foot steps. I dont know if im extremly immature or everyone else is immature. Heres an example one day my teacher was explaing something about peru and lake titi caca (im not sure how to speel it sorry) and everyone bursted out laughing like crying laughing and i was just sitting there thinkkk wtff ? is up with people. I dont know what to do anymore its been like this since 5th grade and each year it gets wose and worse and when i tell adults they tell me what do you think your speacial or something. idkk what to do everyone seems so sheltered and spoiled and there is not one person in that i really can talk to anymore . i had a bestfrind and she felt the exact same way . till recently i realized we became two diffrent people that cant stand each other. Is there anyone out that feels the same way ? am i the one whos ignorant and closed minded . because i always end up questioning myslef of who i really am . when i really still trying to figure it out. Its lead to this and i dont know what to do . Any words of advice ?