 If you liked
Katekyou Hitman Reborn!
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 ...then you might like
Ookiku Furikabutte
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The main character in both are quite self critical, but eventually realize through hardship and friendship that they are unique in their own way, in Hitman Reborn although he's less timid but he still ends up getting scared and beaten up (in a funny way) quite frequently similar to Mihashi