The I2P network transports and protocols are designed to provide anonymity within the I2P network while using I2P network specific applications. I2P is an overlay network, it is not a a way to access clearnet sites.
I2P is not an VPN, I2P is not Tor browser.
It does allow people to provide outproxies services to access clearnet sites. These are independent services, the best of which is operated by StormyCloud.
You can also mirror sites to the network. https://www.reddit.com/r/i2p/comments/1gbqexs/can_you_access_clearnet_similar_to_tor/
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