Never getting wanted role at new champion select

Just ended my placement matches. Went ranked because riot took team builder from us. Out of 10 matches with declared primary role as bot got adc role only 3 times. That's not counting matches that didn't start bcuz of leavers. There i didn't get adc as well. So it's more like 3/15. Come on. How should i play ranked games when i can not get my primary role? With new system i expected getting my role 50-70% of time, not 20%. And there are people on boards saying that they stuck at adc which they don't like. For god's sake. I even not interested in ranked. I just want to get into game asap and with champion i want to play. Not waste time in draft metagame and then waste time at lane i like much less.
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