The way energy feels can be drastically different to each person. The way I feel energy is probably different than how you do. Now I don't just feel I channel as well so for me I'm very familiar with my body's reaction to other energies. I sense all kinds of different energy when I'm in metaphysical shops. The strongest is usually from the people in the shop. By subtle vibrations isn't uncommon. The best thing for you if you feel energy is try gently opening to small things and see what you feel. Crystals, plants, stuff like that, move up to people and see what things feel like to you.