Am I Wrong?

Sorry for the long post but here it goes. There's a man that would tell me hi and ask how I'm doing every time he seen me walking home. I never thought anything of it and would always reply just to be nice. One day he approached me, introduced himself and asked me for my number and I gave it to him, this was less than 3 weeks ago. We then started having actual convos and I became mentally attracted to him. Feelings grew pretty quick for the both of us. I'm 20 and he'll be 29 in the next month. Within the short amount of time we shared a lot of personal things. We acted like a couple. We had names for each other and kissing but we weren't in a relationship. We spoke about sex but I always let it be known I wasn't ready yet. Last week, he invited me to his place and I went. We watched a movie and he was kissing and touching all over me. I can't lie it felt good but I still wasn't ready to have sex only after 2 weeks of knowing someone. He got mad that I wouldn't and had a major attitude. The next day he said he was done with me so he can focus on someone else more mature. Is he right? Am I immature for not being sexually intimate with him? I really liked him and want to work it out. thanks in advance for any advice.