The quote reflects a sense of resignation and acceptance regarding the inescapability of the past. The speaker acknowledges a desire to change what has occurred but realizes that such wishes are futile. The notion of "if"s represents the endless possibilities that could have existed, but ultimately, those thoughts lead to disappointment.
Instead of dwelling on past regrets, the speaker decides it's best to focus on the present and what lies ahead. This shift in perspective emphasizes the importance of moving forward, freeing oneself from the burdens of yesterday in order to embrace new opportunities and experiences.