Probably not means possibly so. Acknowledging what you did is the first half. The second half is expressing remorse and the desire to remedy the situation with the parties concerned. Whether they accept the apology is beside the point.
It's also important to try to forgive yourself. I carry baggage, specifically over the way I mistreated my younger brother when we were kids, and even though he forgave me years ago I still struggle to lay down that burden. Even he doesn't want me to but...it's like it's part of my identity to beat myself up over things past me did. But I do try to let go of it.