Is a firework alternator too ambitious?!

Hey, so I'm 5'2 about 120lbs,female, I was surfing a 7'0x 21 x 2 3/4 for a couple of weeks and it worked well for me...I'm looking at a firewall alternator 6'4 x 19 1/2 x 2 5/8 as previous board was borrowed and I think 6'4 is more suitable for my weight etc....however all reviews suggest the firewall is fast and I'm not sure I'll keep up with it!! Any thoughts appreciated
Also I have an 8ft mini mal which in the rare times I used it felt like a mission just to get the board out past the breaks....

Also I have an 8ft mini mal which in the rare times I used it felt like a mission just to get the board out past the breaks....