Should I start longboarding?!

Hello,
I have been surfing for a while now and have been using a short board, which I really enjoy but my local spot is the witterings in the Uk which is infrequent and often has small waves. Sometimes when I go down to the beach the waves are just impossible to ride on a short board but all the long boarders do really well. Surfing on a longboard looks like great fun and just a tad easier as well!
I have recently bought a modern fish so I don't particularly want to go straight into getting a new board but if I decide to, I would like to know what the cheaper option would be (if there is one) and what size, I am 14, I am slim and about 5'4"
Thank you xx
I have been surfing for a while now and have been using a short board, which I really enjoy but my local spot is the witterings in the Uk which is infrequent and often has small waves. Sometimes when I go down to the beach the waves are just impossible to ride on a short board but all the long boarders do really well. Surfing on a longboard looks like great fun and just a tad easier as well!
I have recently bought a modern fish so I don't particularly want to go straight into getting a new board but if I decide to, I would like to know what the cheaper option would be (if there is one) and what size, I am 14, I am slim and about 5'4"
Thank you xx