Hi Madez,
This is an offline single player world and I want to keep it that way. However if you wish to play on modded servers, there are many in the multiplayer section of the forums. Alternatively you may find servers dedicated to official modpacks. Have fun browsing!
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And yeah... it's weird to have a lot of kids around... it's like "Hey, im 19..." and suddenly everyone keep away from me, like if i'm radioactive or something like that, lol