Angels normally respect one wishes. All you need to do is explain to them that you are not interesting in working with them and that you would like some space. They normally listen to such a request and often stand down. However, in saying that running away from angel energy is typical impossible since many of them are around the earth. But they do listening and will stand down if they don't stand down after your request then it's possible that it might not be an angel. Since many spirits often lie about being one.
Being firm in your thoughts about being left alone is key. Smudge your personal spaces including your temple or body, room/home, car, office, or other places you may spendtime often. This will help to cleanse your life of unwanted energies. You can also then put up protection wards to keep unwanted energies from entering your person spaces. A ward can be a simple casting of a circle to a more in depth version that may include sigils, charms, spell bottles or mojo bags. Carrying a piece of Peridot, Jet, Smokey Quartz, Black Tourmaline, or Amethyst can also help protect from the presence of spiritual beings particularly if they are unwanted. Spirit communication is not easy but continued practice helps to handle all the different situations one may encounter with any energy being.