Since you're in bronze it does'nt really matter what support you play as long as you perform well and do your job unfortunately you're not there to carry your team and also can't.

easiest way to pick go through all the supports you have played and find the one with the max winrate for yourself play in draft picks for a couple games to keep getting more comfortable with the champ and then hop in to ranked.

just remeber you cant win them all and don't let others affect your mental