I know you have never let anyone in completely because you're too guarded, too independent, and too reserved. Nobody has had the chance to reach you fully because you haven't let them. I think it's time to let yourself be free from the chain you had instilled years ago.
Love is scary but love bravely anyway. Open your heart and love. Dismantle your walls. Lower your guard. Diminish any barrier standing your way. Love fiercely and fearlessly by not buying into the idea what love should be. Allow yourself to fall in love without a care in the world.