Marriage isn't as easy as 'find hot chick, date, live happily ever after'. If you want to be married you need to be financial secure, ideally, mature, self sacrificing, patient, loving, able to learn and discern your spouses needs, you need to be content and happy with who you are and not expect the other person to fulfill you.
You need to know the role God set for a husband, and, a father, if that the plans too. None of this stuff is easy. When i was in my 20'si thought i knew about marriage, now i'm 36 and realize i knew nothing. Which meant at 15 i knew even less.
Also, just because God tells you He has something planned for you, doesn't mean it's immediate. Perhaps He's telling you so you can take the appropriate steps to LEARN about being a husband, not to go on a manhunt for wife at 15.