ruthiek, you have my sympathies. Bullies are into power play and can spot the vulnerable and use them as pawns in their game. Unfortunately bullies can also be very charismatic and persuasive so that other people don't see the problem, but you, the victim know only too well what is going on.
I was bullied in a Saturday job when I was 16, it was horrible. I also got bullied about 10 years ago by a friend who I had supported a lot. I introduced her to a group of other friends, some of them long standing, and then one day she got annoyed with me and ran about telling them all I had had a row with her and been horrible. What was hard to take was one former friend in particular who simply refused to acknowledge there was a problem. I pulled back from the group (we were walkers) and the last I heard she was still thick as thieves with them.
It's very hurtful when people behave like this and it does make you wary and perhaps that's a good thing. I am slightly less trustful than I was and I stand up for myself, especially if I sense someone trying to take advantage. Trust your intuition, if you think someone's not being straight with you, they probably aren't.
I think it takes determination to put this sort of thing from your mind, it's not easy but time does heal. As for forgiveness, well, when the time is right, forgiveness comes I think but there's no harm in being angry that you were treated badly as long as you don't dwell on it. Tell yourself you are above the bullies and well rid of them. Perhaps one day they'll even be bullied in turn and come to regret their actions.