Ever noticed yourself saying "yes" to others just because you care about your self-image/reputation going down??
This is where we make our biggest mistakes!
I too have said yes to many and regretted it and still do at times. It is indeed easy to yes to every request on our time and that is because our priorities are not clear to us. When your days are not guided by an inspiring vision for your future, a clear image of an end result will help you act more intentionally and it is not hard for the agendas of those around you to dictate your actions.
"If your priorities don't get scheduled into your planner, other people's priorities will get put into your planner."
The solution here is to get yourself clear about your life's highest objectives and then to learn to say No gracefully. I know this seems a bit tough, but trust me this will not only help you become the person you've always desired to be but the feeling of that fulfillment will advance you.