
first off, good for you for being able to articulate your thoughts and concerns so well. for 19 you really seem to have a good handle on yourself. it sounds like she really wants a firm commitment from you (maybe too firm) and i imagine that comes from some amount of being hurt in the past or being insecure. from the sounds of it, that need for commitment is part of what's driving you away a bit. a few months isn't nothing but it strikes me as a bit too soon to be talking about marriage. (1/2)
I think you should talk to her. It’s great that you figured this out for yourself, but I’m not going to lie. I was in the same predicament, and I realized that I started to grow resentment for my significant other because I just felt trapped and tied down too fast and too early. If you’re already feeling this way, you’re feelings will likely not go away nor will they be dismissed so I highly recommend either taking a break and figuring things out for yourself or possibly breaking up.
maybe you can talk to her about your need for a little more space and a little less commitment while reassuring her that you like her and want to stay with her? if she's truly only dating to marry as soon as possible, it might not be an option though, and in that case you're just looking for different things and there's no shame in that. you formed a connection but it wasn't what you needed right now.