I can relate to your highly sensitive nature. Here are some exercises that a gifted spiritual teacher of mine, shared with me:
Try this.....
First, remember that energy follows intent.
Make it your intention to open up to Source (God, Goddess, Allah, etc.)
Send white light energy from Source, to every level of your being, transmuting any negative energy with love and light.
Call upon your Higher Self (your God self) to merge with your physical self.
Say out loud or in your mind, but focus on the words as you say, "I am love, I am light, I am One with God".
Set your intention, and say "I sever all links and bonds which are not loving, from my energy field." While doing this picture yourself actually cutting literal ties from around your body.
Then say, "Thank you _______ "(whoever you have been linked to and are sharing in their energies) "Thank you _______for showing me that my freedom and my peace come from choosing love. I choose love now".
It is now important not judge this person. If we get angry or frustrated (a sign we are judging this person) then we re-establish links and bonds and need to do the exercises over again. Judgement=interfering with the free will of another. When we think, "I can't believe Bob is angry again about such a little thing! He needs to get over this and work on his anger!", we are in judgement (and all judgement comes from fear and opens us up to negative energies). When we can simply believe "that's Bob, it's not how I would react but he is free to choose his experiences", then we are in love and can avoid sharing energies with this person via links and bond.
I believe the more we do this the less we will share in the energies of others. Also by engaging in this practice, we grow in love, we open up to the truth of who we really are, and we raise our vibrations, which not only benefit us but the entire plant, as we are part of a collective consciousness.
This works amazingly well for me when I do it. In fact, it works every time.
Love & Light!