Your champion pool is way too large. Stop trying to fill. Accommodating your teammates is nice, but your rank is ultimately a reflection of your own personal performance. Pick two champions/roles to main, and try to get them whenever possible.
If you don't feel confident in top/jungle, avoid them. Pick a single champion that can play both roles properly to go to whenever you're forced to. Fizz, Hecarim, and Rengar are good choices for both top and jungle currently.
The main issue with the current jungle, for beginners, is that it's pretty hard to stay alive in it. If you're having issues, just default to a really strong clearer like Udyr. Another plus is that his kit is extremely binary and hard to screw up.
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http://na.op.gg/summoner/userName=missou
On this account, I mostly play Hecarim top, but as I've mentioned before, he can jungle as well. I literally just say "prefer hecarim top, can jungle" each time I enter champ select. Aside from the times Hecarim is already picked or banned, I haven't been forced off of Hecarim a single time this season.
If you pick a champion that can play multiple roles to main and perform well on it, you will rarely be pushed off of it. People tend to look up your stats when you ask to play a champion, and will respect your preference if your stats support it. Which they should, if you're going to main a single champion.
