What are the best dildos for beginners?

I was wondering what size a beginner anal dildo should be? I have done finger sex before and I bought two dildos, one is a 6 inch fantasy dildo and the other is a 14 inch long tentacle dildo, both are about an inch in diameter at most and both cause mild pain at the entrance. I was wondering what size a beginner dildo should be in diameter so that I can get one that doesn’t hurt. Also one question, is it normal to be able to handle a 14 inch tentacle if you have never done this before?

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