So I learnt how to surf last year, and can only surf 4-5 times a year for a couple days, except in the summer where I surf as much as I can. I would say I've done over 25 full days of just surfing so I've done about 125 hours of surfing. I've learnt and still am learning on an 8ft foam board but I'm struggling to learn anything new, such as surfing down the line because the water turns into white water before I get the chance to turn. Three different surf coaches from the surf school I go to have told me I'm a natural and I'm very good for only having surfed a bit. I want to get a new surfboard, but I don't want to transition to a smaller board and end up hating it because it's too advanced and I can't do anything on it. I'm 15 in 2 weeks, I weigh 75kg and I'm a girl, I'm overweight and I am on my way to becoming slimmer. I am pretty fit as I'm a competitive swimmer. I'm striving to lose at least 7kg before I get my new board, as I don't want to get a one while I'm heavy and then lose weight and end up having a super buoyant board. I'm thinking of getting a fish or a fish hybrid at about 6'6. I'm really not sure though what's best, I'm just struggling to get over waves on my current board because I can't duck dive which sucks. I'm open to all criticism and yes, I know I'm a beginner and shouldn't progress too fast, but I don't want to stay on an 8ft foam board. Is it better to get a fish or another foam board/mini-mal at 7ft?
age/gender: 15, girl
height: 75kg
weight: 164cm
p.s. I would just like to add that I'm very passionate about surfing and I really enjoy it and being in the water