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Sorry if this offends anyone, nut the violin is a pig of an instrument to play. I've been playing 6 years and am still stuck on grade 4 pieces. I can't get it to sound right. I can't get the position right, i can't get the hang of third position. And i practice loads. It's just a complete pain.
Something doesn't sound right here. Is your teacher really any good? Has he/she taught anybody to a high standard? If not, change teachers, and if you haven't got a teacher I really recommend you get one because teaching yourself to play the violin is just too hard for most people. There are so many subtle aspects to the correct posture and it's so easy to go wrong on your own. I've rarely met a self-taught violinist who plays well with a nice relaxed posture.
If you do have a teacher and a half-decent violin a good teacher should be able to enable you to get the best out of its tone. They should also definitely be able to help you to get the position (I'm assuming you mean posture here) right. Third position isn't that hard to teach if you have a good method. If you're practising loads you may be practising everything wrong so at the very leats I suggest you go to a good (or another)violin teacher and ask them to point out where you're going wrong.
I promise you, it's all sortable!
Violinia