i cant socialize at all nowadays ugh its too much

i dont know what is happening with me i cant socialise at all nowadays and its getting concerning

ill share one short instance i was standing near my class it was raining i was waiting for my dad a guy from my class came and just asked me you forgot your umbrella idk what happened i took step back i behaved very cold and felt threatened by just this i felt like why he is talking to me does he like me is he a creep what he wants from me even when lowkey i knew he is talking nicely but why tf i reacted this way even when i walk on road i feel like people are only watching me i feel threatened when im alone , few days back i started talking again to my talking stage i fought with him on something and i msg him becuase i think i needed someone to talk to but then now we are talking i feel like no i dont want i delete our text after talking like im giving myself validation that we didnt talk and now he is trying to connect on socials also but i feel he is invading my privacy i feel we not gonna talk after some days he doesnt interest me that much also so why to let him in my socials idk man please someone help me understand myself