Do not even think about marrying him.
You are only thirteen.
And he is only fifteen.
You should wait a while.
Seeing as you are so young and you still have your whole life ahead of you.
Keep in mind, that whatever you choose, if you choose to get engaged him, it has to go through your parents as well.
And you should also remember that if you DO get enganged to him, and you eventually DO end up marrying him which cant be until you turn eighteen... You will be with him for however long it will last which wont be very long because marriages like that usually go haywire.

And if you end up regretting it, it will be with you for the rest of your life.

Wow, are you serious? 21 days? lol. i'm sorry, but i think it is much too soon for you two. you two are still way too young to be getting engaged or anything like that. so after 21 days you think you love him? >< let me tell you something, my friend was in your same exact position and she thought she was in love too. she wasn't. he ended up breaking her heart into PIECES. PIECES I TELL YOU! lol. yeah. it's much too soon my dear. why are you thinking about marriage and commitment when you're only 13? you're still young. trust. when you wait it out and you guys are still together when you're older, then that means you two were really meant for eachother. don't you think? wouldn't it be better to get engaged and what not then? :)

Yeah, my boyfriend &I have been together for almost a year, [-5 days] &we don't even talk about being married.
o.o

21 days..?
13 & 15?
engaged?
uh i think youll need to grow up alittle
before committing yourself to anyone sweetie.