Help with feeling and not resisting feelings.

I have noticed that when I practice feeling a feeling, my body doesn’t have any vibrations. It is still, peaceful like a dead body. I think I resist the feelings a lot and I am afraid and reluctant to feel them because in the past I experienced a looooooooot of discomfort feeling negative emotions as well as very happy ones. So, now my body just goes into still, peace mode which makes my body have no or really little vibrations. PLEEASEEE HELP!!!!!!! How can I stop resisting and feeling again??????