Hmm.. me personally, this ability came out of no where to feel energy. It happened when I was on my bus, and this kid sat next to me and I just felt so negative, sick to my stomach, I had to leave that spot but I couldn't. within 30 seconds later, he pulled out his cell phone and started cussing at his friend.
Anyways- By becoming educated, practise, meditation, you should be able to develop this ability. I think this is a very basic ability. Once you have that first experience, you can hang on to how you did it, and use it for when you need it. The higher form of this ability is empathy, and feeling the pain and emotion of others.
Tip: I suggest being around the energy of crystals. Amethyst, and Lapis Lazuli are psychic stones. Infact, during the time of my development, I was wearing a lapis lazuli pendant. Look in to how to cleanse, charge, program crystals. Moonstone is also another psychic stone.
Hope this helps. Blessed be x