Are we just being silly?

When I became a teenager i rushed as fast as i could into relationships. As a result, my mom became VERY strict and i got in huge trouble over boys a lot. Now, at 16/17 in two weeks, i mentioned to my mom about my current boyfriend a couple months ago, and now she wont stop bringing him up, giving me advice, and so on. She seems to think that suddenly i'll end up marrying this guys! We have been dating 11 months but she only really got involved recently? She likes my guy and she asks of him and generally makes me feel pretty good about it all. All this has encouraged my boyfriend to start considering long term, marriage and so on. I try to be realistic and think that even thought i love him, we may not last, we are only teens. But my mom and boyfriend seem to be hoping us to stay togetjer forever? Im in no way saying that i am anticipating a breakup or looking for a way out, but as a teenager i have to keep in mind that things change. Should i be wary and not really get excited about this or just go with the flow and plan for a future together?