I have dealt with bullies in school, and now that I am in my mid-60s, I am dealing with them still again! I never dreamed that I would have to deal with them at this age in my life.
I finally spoke up and said that I was not in the mood to be bullied about a month ago. (Back in school, I beat the living daylights out of one of them and they stopped bullying me, but it took me a whole year of being bullied, before I finally had had enough and did it. I did it when one of them actually came onto my property and bullied me there in my own front yard (can you believe it?!?). Since I spoke up, the recent bully has backed off. However, it was someone who spoke up for me because I complained, that things happened and the bully was told if he didn't leave me alone, he would be banned from the Social Club we both belong to.
Now the bully is giving me the "silent treatment." That is better than being bullied, but is another bully tactic to make the target feel intimidated.
Anyway, for me, having a therapist has helped a lot. She told me, for instance, that one only has to say, "No." or "Stop it!" and that one should not try to explain it further. If you give an explanation as to why you are saying "No." you leave them an opening to come back at you with more BS. And that is usually what bullying is. It is composed of LIES.
Look back at all the things the bullies ever said to you. These things ALL are lies. Don't believe them. My bullies told me I was "ugly" for instance. I believed them, because no one had ever told me I was pretty. However, in looking at photos of myself from those days, (and I have asked others about this too) people say I was PRETTY.
So don't believe the lies. Bullies bully because they are jealous of you about something, or they have a low opinion of them self and need someone to boost that opinion of them self on to pick themselves up, so they pick on you to make themselves feel better than you. Or more important than you. Or something like that. But they are not. They are MEAN spirited people, who have nothing better to do than to make someone else's life a misery. Don't let them!
Believe in yourself. Think about your good qualities. Look at the nice things you do for others. Also, do things that you enjoy doing, try to take your mind off all this by that means.