You said you are shy and quiet and mind your own business. He sounds creepy. He has deliberately continued to talk to you because he senses you might be someone who will just go along with what he wants — to date young girls. Do NOT go anywhere with him. Stop talking to him, and if he initiates a conversation, keep walking. Find people your own age and make an effort to get to know them. Slowly start making plans with them and try to get more involved in your own life. You will start to see him differently if you do, I promise.