Bite my foot desperately = Bite is unwilling to lose you,
I know it's harmless, but I'm still scared, walking around, but I can't get rid of it = you know he's harmless, but you don't like this man, so you avoid him all day. There's no way to avoid him.
The family around you are indifferent and don't help me = this is between you and him, and the family can't help you, or they think you'd better stay with him, so they don't care about your business.
Open your mouth and bite a lot of holes, but there is no bleeding = he gives you the feeling that a dog bites you. Although it is not badly hurt, it also makes you feel uncomfortable.
This dream is an evaluation of a boyfriend if you are with him at present.