Wanna Be Surfer Girl- Am I using the wrong board?

Hey all,
I have lived 1 mile away from the beach on the jersey shore all my life. About a month ago, I took a surf lesson and absolutely LOVED it! I stood up about 8 times and rode 3 waves all the way to shore in 1 hour.
For the past few weeks I have been using my friend's brothers board (in the picture on the left). It is an 8 foot wavestorm and about 15 lbs. With this board and on my own, I have barely been able to stand up. I am a 5'7" female who weighs 140 lbs. Is this the wrong board or am I just still really terrible and need to keep practicing? I also have the smaller one pictured, but I figure this pointy one is definitely too difficult for me at this level.
Thanks!-Wanna be surfer girl
I have lived 1 mile away from the beach on the jersey shore all my life. About a month ago, I took a surf lesson and absolutely LOVED it! I stood up about 8 times and rode 3 waves all the way to shore in 1 hour.
For the past few weeks I have been using my friend's brothers board (in the picture on the left). It is an 8 foot wavestorm and about 15 lbs. With this board and on my own, I have barely been able to stand up. I am a 5'7" female who weighs 140 lbs. Is this the wrong board or am I just still really terrible and need to keep practicing? I also have the smaller one pictured, but I figure this pointy one is definitely too difficult for me at this level.
Thanks!-Wanna be surfer girl