I'm so dissapointed right now... Im at the point in the game where I have the second druid and I'm on my way to bring him to Aveyond, and I'm also bringing the good witch boy to the school to the west, except suddenly the boat is not there. When I walk into the boat seller's house and walk out, it shows up underneath me to my left and follows me but I cannot get to it and it disapears again unless I come out of that house. My boat is not there, I cannot get into it! Please help me.... I don't know how to fix this.

Try checking the two other ports on that island, sometimes a computer clitch does what you are describing. Like
a corpse may follow you, or your next boat the clipper ship will be at a different port then you thought and when you try to get in it won't let you.

I'm sure your canoe is at another port.
Pixann