Need help seeing clearly

So, I'm not with this guy, but it's a sticky mess and always has been. I met him at his job when I was 16, and he was 33. He worked at a phone company store, and he was helping me with a hell of a mess. Anyway, because of the mess he had to text me from his personal phone, so I instantly got his number. We flirted and what not while he was helping me and it was nice. I founded some dumb excuse to text him that night, and one thing lead to another, and we were talking nonstop. Asking silly questions and finding out stuff abou eachother. He finally asked me how old I was, and I made him guess. He guessed 22, and I told him the truth. He said that sucked because he wanted to ask me out on a date. But things got weird between us. I suppose we've just been best friends on and off, along with fwb. But whenever we hang out he always wants to have sex. I always catch feelings for him, even when I don't want to. This has been going on since October 2014. He haunts my dreams and I wish I could be with him. I turn 18 in three months, should I try something with him? Or am I wasting my time with him? Is he just playing with my emotions and just using me?