My sister is my guardian and she says lately I have been " bothering" her. what Shud I do? ?

My sister is my legal guardian and were not that close. in tha past 3years I've lived with her Ive had 2 boyfriends.I'm 15years old (i haven't dne anything I waznt supposed to) I've been Gud but I Hav gotten on her nerves.( not about tha bf) but she says things Hav been stressing her out and bothering her I asked Wat was it AND she said "you" which iz meh...can sum1 help meh dnt knw what to do or say SUM1 PLEASE PLEASE HELP.