paddling into waves please help me

ok ive been surfing for about 3 weeks now
ive got the paddling down but when i try to
catch a wave i feel it pick me up and when
i go to stand up the board just sinks and the
wave passes or i get pummeled and washing
machined or it thros me over the falls
plz any advice would be greatly appriectiaed
ive got the paddling down but when i try to
catch a wave i feel it pick me up and when
i go to stand up the board just sinks and the
wave passes or i get pummeled and washing
machined or it thros me over the falls
plz any advice would be greatly appriectiaed