Apologize 3 times, then say "That's fine, just tell me when you want to be friends again," and then just leave her alone." Look for good people to be friends with. Find someone who is not teasing you, someone who has good values. When we hold our values we are happier. "Happy is the man who has not followed the council of the wicked, or taken that path of the sinners, or joined the company of the insolent." "In Torah (good stuff) shall you labor." If you do this "happy shall you be." Being a good person is more important.