I'm very happily married and wouldn't want to go back to being single. Hashem undoubtedly created marriage and parenthood because these relationships require us to be on our best, most giving and loving behavior. Life as a partner in a marriage and as a parent offers tremendous opportunities for spiritual growth. Therefore, you are right on target when you ask why you, living without the time constraints of a married woman, should not perform a mitzvah like wearing a tallis . Tallis is one of those mitzvohs .
Women are exempt from tallis because tallis is a time-oriented mitzvah .
I understand that you feel that wearing a tallis would deepen your prayers. Actually, in the Jewish Tradition, women have such a natural connection to prayer that they do not need a tallis to achieve this. Because women are not obligated to set times for prayers, their prayers can be completely spontaneous, an outpouring of the heart, said at any time of day - even over the housework. This sort of outpouring is considered a woman's unique capacity for prayer. Actually, the model for all prayer was a woman who prayed in exactly this manner.