Is it normal my cousins & i

Hi so it probably started a few years ago during Christmas when two of my male cousins were staying at our place for the weekend. This was at the stage of our lives in which we discovered porn and all of that. Anyway my mother had gone with my sister to a dinner party or something and left me in charge of the house being the eldest(at 12) and my cousins following (12 & 11). The topic of porn and all of that came up, if we had ever jerked off, if we had watched porn before ect, ect. I suggest a game to play and after some requests it came down to truth or dare. And at first it was just stupid things like have you're hand on their d*ck for x amount of time, run around the house without pants on ect. and then it got more competitive and things like touching each other's d*ck and looking straight at it for x amount of time ect. Eventually we just got really board doing these 'easy' dares and Mike (not his real name) dared me to jerk off Jack (also not his name) and I did. From there on more 'difficult' dares came up such as suck each other's d*ck and jerk them off ect. And I don't know who or when but someone was dared to give or receive anal. I don't remember much from past that but I do remember that some of the dares involved all 3 of us.
Is this normal to do this sort of thing/experiment with cousins of the same sex as you? has anyone had similar experiences. Any feed back would be great, Thanks.