Selena Gomez might be enjoying her time with Justin , but that doesn't mean that she wants to marry him.
Selena was recently asked if she plans of marrying Justin someday, and some Beliebers might think that she is crazy for responding, "No, I'm only 19!"
Gomez also admitted that her celebrity crush, Transformers star Shia LaBeouf, isn't the one for her when she said of meeting him, "I was so happy when I saw Shia. I was so starstruck. He probably thinks I'm crazy and I probably made a fool out of myself, but him. I have literally been obsessed with him since I was 15. Shia's older than me, so I look up to him. I don't want to marry him, though!"
Actually the contrary is true—Selena has proved that she's rather smart and mature for being a teenager. Tons of teens (cough,Twilight fans, cough, cough) probably think that they'll stay with their high school forever, but people can change a lot as they grow older (just look at former teen couple Britney Spears and Justin Timberlake).
Their pop star backgrounds might make Justin Bieber and Selena Gomez seem like a perfect match, but Selena is intelligent enough to realize that their feelings might not last as time passes by. And there's no telling what could happen in the future—Justin might become a has-been, while Selena becomes the next Jennifer, for instance.
It also takes a lot of maturity for a girl Selena's age to say that she wouldn't jump at the chance to marry her celebrity crush. So while one may never see her and Justin Bieber walk down the aisle, at least Selena Gomez' patience gives her a good chance of finding the right guy to completely commit to someday (however, it would be interesting to know where Justin stands on the marriage question).