As it turns out, according to canon law you belong (or will belong, when you join the Church) to a geographical parish, depending on your home address. You may attend Mass at churches outside your parish, but you still belong to your home parish.
Can. 518 As a general rule a parish is to be territorial, that is, one which includes all the Christian faithful of a certain territory. When it is expedient, however, personal parishes are to be established determined by reason of the rite, language, or nationality of the Christian faithful of some territory, or even for some other reason.
Call your local chancery office (the business office of the bishop) and find out which parish you are in. If you belong to a particular ethnic group other than that of fully-assimilated members of your country, you might also inquire as to whether a personal parish has been established for the pastoral care of your particular group. At least try your geographical parish or the local parish set up to minister to your group.
I was not particularly wild about my home parish when I first started going there, but it has definitely grown on me!