I would call that abusive and coercive, but I do not think it meets the legal defenition of rape or assault. I had a very similar situation with my first real boyfriend at that same age. I protested a bit at first, but I had always been taught to just make people happy (child abuse survival 101: please the person that has the power). He did end up raping me on multiple occasions, but there were a lot of other emotionally abusive and coercive situations from him as well. It's not necessarily a morality thing or an abstinance thing. Sometimes fear compells us to go along with somethign we don't necessarily want. The fact that he made you feel like crap for not going along with things is abusive.
I didn't figure out my sexuality (at least didn't totally admit it to myself) for another 6 years after the "encounters" with my first bf. It explains a lot for me not really wanting anything to do with him sexually, though i was also "young" and knew I really wanted nothing to do with anyone sexually at that time. I went along with it because he made similar comments. He called me a prude, and eventually used force...
I'm sorry you experienced that. I would suggest looking into talking to a therapist about it also, or reachign out to RAINN.org, or a local sexual assault counseling center (they are often free and confidential).