I dont have much of an answer - just a question and a suggestion. Ive heard several times now that alot of violin teachers dont like to teach adult students - why? Think about the playing techniques and tone of every instrument for a little while first - think about what it would be like to make music with the way each instrument is played. Example - Id never enjoy using my breath to make music on a wind instrument even though I like to hear musicians play the saxaphone, trumpet, flute, etc... - it seems like a good idea to consider those things carefully for a while and stick with whatever you chose.
: I'm 17 with no musical background. I would like to learn the cello but My mum doesn't approve of it because it's a big instrument and she doesn't like the posture either. I've tried piano twice and guitar which I gave up after 2 months so I thought I might be one who couldn't do things right to the end. Another problem is that not many teachers would want older students. It is wise then for me to pick up cello?