Marriage or not??

So I have known my boyfriend since high school and we have been together almost 3 years now. He is “the one!” Like I am 100% and he says that I am the one. We have talked about family, living together and all that stuff. But basically... every time I bring up getting married he says he wants to marry me but he just wants to wait 3-5 years. I will be 25 in June and I have been in countless weddings. He is 25 as well. He keeps telling me trust him and that it is going to be worth it. We just bring it up all the time and it is really starting to bother me. I’m just a girl and I worry about well everything! I just need some advice?! Anyone out there. 🤷🏼‍♀️🤷🏼‍♀️