Severe Bicep Soreness Post Surf! Help !

Hi Guys 
So I’m currently travelling New Zealand and have been surfing regularly for the first time in my life..(I’m 21)....really enjoying it except for a recent bicep soreness in both arms after my last few recent sessions....it’s making me get out of the water early as the pain is so bad... I bought a 4/3 wetsuit from Bodyline which is tight, On the arms but not so tight to cause this I thought !
I wondered if anyone else has experienced this and is it because of my wetsuit? Using new muscles for the first time? Or surfing too often ??
Hope someone can help!
Cheers
Sam

So I’m currently travelling New Zealand and have been surfing regularly for the first time in my life..(I’m 21)....really enjoying it except for a recent bicep soreness in both arms after my last few recent sessions....it’s making me get out of the water early as the pain is so bad... I bought a 4/3 wetsuit from Bodyline which is tight, On the arms but not so tight to cause this I thought !
I wondered if anyone else has experienced this and is it because of my wetsuit? Using new muscles for the first time? Or surfing too often ??
Hope someone can help!
Cheers
Sam