He popped the question, you said yes, the ring is on your finger, and you feel a flurry of emotions. You're happy, overwhelmed, excited, and more all at the same time. Take a deep breath. Having multiple feelings at once is perfectly normal for such a special moment in your life. Beginning a new life with the person you love lends to feelings of happiness and excitement, while the wedding planning road ahead can create anxiety and stress. So having opposite feelings can also be natural.
As a bride-to-be, each of you will feel something totally different, depending on your personality, relationship with your significant other, your background and personal history, as well as outside factors. You also may not feel "fireworks" once you're engaged and that's okay too. You may tend to think you should feel one way or another based on other engaged people you know or how it's portrayed in the movies. But you never truly know what another bride might be feeling on the inside and the movies are, well...just that, movies. If the music cues in your head and you do have that magical movie moment, great! Cherish it forever. If you don't, don't consider your engagement or relationship substandard. You simply have a different way of feeling your emotions. Neither way is better than the other. It just is. Knowing yourself and how you deal with life and milestone events will help you understand your emotions better and happily accept them.