Problems with boats

I was playing a new world on amplifire , and then i saw sea. (i´m in chile an i speak a little bit of english.) then I craft a boat (no I crafted three boats ) because I´m very bad controlling the boats. but then I stop and I dismount for coal. then the boat goes like 8 blocks and start to climb the water without me . then I climb the water . then I throw myself whith the boat THEN MY BOAT WAS ON THE WATER!!!!!! (look the first photo) but then i was like LLLLLLOOOOOOOOOLLLLL then I tried again but the boat cannot do the same bug ;( but when I was trying to put the boat but then my player was buged in the celling (cords and seed on the another photos) (semilla is seed)