"Is what he said about me true?"

I’m 15 and live in California. This summer one of my friends introduced me to a guy. I became friends with the guy and we talked often but then he kept asking me out. I told him numerous times that I just wanted to be friends but he wouldn’t accept it and every time we talked/saw each other he would try to get me to go out with him. Randomly one day towards the end of summer he texted me telling me “You’re just a rich bitch with no friends! The only people that are friends with you are guys and they only talk to you so they can get in your pants! No one likes being friends with the bitch.” I texted him back and asked him nicely to delete my number. He continued to text me, calling me names and being very rude. I replied again and told him that he barely knew me and that he didn’t know anything about my life or what made me the way I am. The texts continued for a while but finally stopped because I didn’t reply.  I’ve told my friends/family what happened and I laughed it off saying that I didn’t care what he said, but honestly I do care. After he said that to me I started doubting people in my life. I’d hang out with people and think, “Does he just want to get in my pants?” “Does this person secretly hate me?” “Do they think I’m a bitch?” “Do they think I’m a spoiled, rich bitch?” I’m doubting people I’ve known for a long time just because of something one guy said. What he said has also made me doubt myself. I often find myself thinking, “Am I acting like a bitch?” “Am I a slut because of the amount of guy friends I have?” “Is what he said about me true?”