While the Torah in its entirety belongs to every Jew, each of us also has a particular "portion in the Torah," a part for which we have a special affinity, and other parts with which we resonate less.
As the Sages said, "Let a man always study what, and with whom, his heart desires."
Though one must strive ultimately toward completeness, it is permissible, particularly when first setting out, to concentrate one's efforts on those areas to which one's heart most readily responds, at the expense of other things.
–Rabbi Adin Steinsaltz
From Teshuvah, p. 40, by Rabbi Adin Steinsaltz