You don't choose how you feel. Your emotions are instinctively triggered by your thoughts. You do, however, get to choose what you do with those emotions.
I learned a long time ago to not give the negative any attention, because giving it attention gives it power. So I would ignore those lower-level thoughts and suppress what I was really feeling by focusing my attention to something positive, try to justify the experience, or by just deny that I thought what I thought and felt what I felt. Other times I would try to convince myself that I shouldn't feel that way, try to let go of it, clear it out of my energy field, release it into the Universe, or cancel the energy ("cancel, cancel, cancel").
What I didn't know was that the negative has power whether I HONOR it or not and that using these other means was just hiding the problem - masking the symptom like taking a pill for a headache.
When you use the Infinite Healing™ tools to HEAL, you HEAL your perspective and the emotions that were triggered, which prevents them from settling in the physical.
Now that I have learned the difference between ignoring the negative and HEALING the negative, I am not a victim of other people's actions, I can honestly say that I know what flowing in Unconditional Love & Unconditional Gratitude™ feels like, and I often smile just because life is awesome.
I hope you are able to learn the difference.