You people with hearts have something to guide you.
Tin Man, The Wizard of Oz
Ways to Forgive:
Write a letter to someone who you feel has done you wrong, explaining your perspective. Then burn, throw away or recycle it as you verbally express your forgiveness.
Make a list of people you feel negative emotions towards. Next to each name descibe why these feelings come up for you. Envision a conversation with each person, where in the end you tell them that you have forgiven them. Once you have completed the list, get rid of it.
Complete a forgiveness meditation series. We like the Headspace app, but there are many others available online too.
Find a therapist to work with in person, or try out an eservice like Talkspace.
Make a list of all of the times you have done wrong by others. Work through the list by accepting where you were at the time, offering a mental, written or verbal apology (this can stay private) and hug yourself as you tell yourself that you are forgiven.