I can feel myself getting defensive, but I'd like to learn more about why you said what you did. Of course I'm not self-absorbed. You might be right. Do an awareness check. Keep your focus where you are at the moment, instead of mulling over other issues or concerns while you take your lunch or run errands.
Preoccupation often contributes to what others experience as rude behavior.
Make a point to notice other people around you. You've spent considerable time talking about the new skill you are going to learn, or your spiritual practice or a project you're going to take on. Thought precedes talk, and talk often precedes action. It can be daunting to move from talk to action, particularly if our goal for a new skill, project or practice is a lofty one, full of idealism or requiring considerable work. Actually being or doing what we envision can sometimes seem overwhelming.