Why does my boyfriend seem ashamed of our engagement?

Stephanie makes a good point. Most likely he is fearing that others will not take your relationship seriously, since you both are so young. Or maybe he is not as serious as you are. Regardless of what we think, we dont know the whole background of the relationship. Only you do. The best thing would be to talk to him, and let him know how you feel, and see how he feels. If you open up to him about your feelings, he will most likely do the same back. Make it easy for him to tell you how he feels, without the pressure that you could get mad at him.

Maybe he’s not ready and he doesn’t want to tell you because he thinks you will be mad. I know you don’t want to hear this, but 17-years-old is just too young for engagement. I don’t think he took it as serious as you did maybe, I don’t know. There could be other reasons to, maybe he meant it more like a promise ring. Theres no problems with giving someone you love a promise ring, but an engagement ring is a whole new level. Catch what I’m saying? I think you need to have a serious talk with him.