Depends if your rating is still provisional. If you've played less than 25 games then it can still go up hundreds of points in 1 tournament.
I didn't know you could register a different membership... doesn't sound quite right. But if it is possible, and you're willing to pay for it, just do it. Otherwise I guess you have to listen to your dad.
A few years ago, I played in a few chess tournaments without much preparation and a lackadaisical attitude and ended up sinking my rating all the way down to just under 600. Keep in mind I was only 9 at the time, and since then, I have improved much as a player. The chess coordinator at my school (who happens to be a USCF master) says I play at about a 1600-1700 level now. However, he says it would take "half a lifetime" to make the 1000 rating point jump and that I should register a different membership in order to hasten the process. The next day my dad called USCF who said that creating a new membership wouldn't be necessary and that my rating would rise drastically and reach 1600-1700 level after a tournament or two. The question is: Who should I listen to? How hard is it to raise my rating that high?