Support 101 for beginners question

I'm new, barely lvl 11. Being in really low elo (with good reason), means that I get a lot of weird team comps. I was wondering what my role is as a support when there's no ADC to support. It's getting to the point where I don't pick support in games without one because I don't feel like I'm doing anything. I feel like most other non-ADC heroes can support themselves fine, for the most part, and I'm just being carried as Taric/Lulu/whatever until lategame and taking a team slot that could be used on a hero that's either better at killing other heroes or better at botting than most supports.
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