İ am confused

Hi guys , i know i am too young to talk about these and such but i really need help and dont know where to get it other than Reddit . İ am a male (12) that lives on Turkey so sorry if i make mistakes in text . İ go to 7th grade and there was a girl in my class , lets call her G. G was pretty , fit and etc. But her family is weird . They forsake social media , whatsapp and even pinterest to her . We were friends since 6th grade but i got her number only last friday . So we started texting in sms . And i was jokingly calling her pet names (its a thing we often did) but she suddenly texted “i love you” and i didnt know what to do so i just accepted and now we date . Look , i am just 12 and i know middle school relationships are just small things that wont effect my future even %0.01 . But i still want to not hurt her feelings , i am also too afraid to tell her i want break up since 1-we just started dating 2-she often says how alone she is and how much she loves me 3-she is more of a popular person than me so a break up could change all other girls and boys opinion on me İ want advice to make her break up with me . İdk , if i dont reply to her texts , be ruder and ignore her , would she just go or… i am confused . İ am too embrassed but tomorrow is school so i am gonna see her . Please give me advice on this one