After months of searching and economic drawbacks, I finally got a bass (a Cort Action V - A). I jammed for about 2 hours with some friends, and when we finished I noticed my right wrist-forearm felt a little sore and my index and middle fingers too. Is not a bothering pain or anything, but I can notice it, also my fingertips feel like I got a 1st degree burn, but I suppose it's normal. I have to say, we played mostly, if not just, thrash metal, so there were a lot of 8th and 16th notes and in general things were fast. Luckily I've been trying to simulate bass on my right hands so I didn't have much problems or felt tired on my hand. So here's the real question: am I doing something wrong? Or I'm just being paranoid and it's "normal" to feel this way when starting to play? I tried googling, but I couldn't find any info on this. Thank you in advance.