Girlfriend problems. guys and girly can help me. plzz help me i need it?

well i am 13 and my cousin who is 23 was talking to me about stuff and he told me that you need to show the girl who's boss so like a few days later me and my gf were sitting in a friends basement watching tv and holding hands and i was making our hands hit my stomach and she gat a lil mad about it and tried to pull her hand away but i wouldn't let her since im a retard and she got all pissed about it. and also when she calls herself fat i tickle her since she is like rly ticklish (i dodnt think shes gonna stop since she prob likes it) and she tried to stop me so i grabed onto her wrist and tickled her with my other hand and i guess i grabed her wrist like rly hard and now today i talked to her on the phone and she thinks im an . (i am). and i told her i was sorry and about to cry since i was and she told me not to be sad she wasnt gonna break up with me and i trust her that she wont and i told her "i no you hate to talk on the phone so im gonna let you go now. continuing.......