I'm new here... and pretty new to surfing in general!
I've been surfing for about 5 months now, reasonably regularly (at least once a week usually about 3 times) on a 7'2ft mini mal - 22",3" so quite a big volume - but has been an awesome board to learn/have fun on and I am now reasonably confidently surfing the green waves and can 'trim' left and right

The reason I am asking, is the past two days I went out with my friends who were on shortboards and they were able to easily get past the whitewater whereas I struggled quite a bit. Granted they are a lot more experienced than me and better paddlers (and I know I need to improve on this) however I did feel that my board made it even more difficult for me as when I tried to duckdive I couldn't manage to get the board deep enough that I wasn't taken back with the wave.
I was wondering whether you thought a shortboard (or one with a bit less volume) might be a good option to look into or whether you think I should be able to duck dive my current board and it is more my lack of strength/experience?
I'm female, 5'2, and about 125lb. I'm reasonably cardiovascularly fit (do a lot of road/mountain biking) however perhaps a bit weaker in the arms!
I'm not looking to sell the 7.2ft as I think it's an awesome board to take out on smaller days/when the white water is a bit easier - however if I were to look into a shorter board, what do you think is the next step for me?
Sorry for the very long speal but thank you in advance for your help!!