Aram champs rotation problem or the mode is just like that

Well I’ve trying aram for a awhile and I guess i not that bad, but my problem is I’ve been playing for 3 days and I don’t know if it’s normal or some bug or just riot hates me xD but I notice I keep fighting the against the same champs over and over and over
2 ad and 3 tanks and it’s the champs ????. I even ask other players if they have the same problem and apparently I’m not alone xD and it’s just frustrating xD and yes probably some ahole will say well git gut mate!! XD or you just suck like always XD maybe I just shouldn’t come back to this game took my life back at the released and later on xD but yeah riot probably has to fix that thing or whatever xD.