Please help me decide on a career in music?

Sorry in advance for the kinda long question.

I want a job in music, I am a guitar player and im 18. I would like to be involved in some way with the music I like which is rock (I know there's lots of different types). I wouldn't like to be involved with the manufactured pop star of the week type of thing if possible. But my question is are there any careers in the music industry which pay over 拢20,000 a year which are stable and reliable, unlike sound engineers, because I thought about that, then I heard it's really hard to get started in and you have to work for free for a while and there's no work out there for them etc... I'm willing to go to college or University to get the career but I feel I need to be guaranteed a job at the end which has good job security and a good salary. I know of a few guys who have tried to be sound engineers and it was so hard to get a break that they now work in tesco and mcdonald's and stuff like that. And that is not cool. I have been talking for ages so i'm going to stop now, but PLEASE! HELP! me find something to do.Please help me decide on a career in music?
Its very hard to get in and you can't make it a career out of it, maybe you should try other career options and can do this part time just for fun.