OK I am 18 and I have decided to start working out, this is not something I usually do but I want to change and get fitter, I usually start of by doing a 10 min exercise, for me I only want to work out my upper body so I usually try and do weights with my arms, but the only problem I have which is really annoying and it frustrates the hell out of me, is that for my left arm I hear a clicking sound when I lift weights, and it totally puts me off and I'm not sure if I can carry on exercising or whether I should stop.

Without knowing more it's hard to say - I'd get a doctor or at least a trainer to check it out to be sure it's not something serious - you can get various clicks and things that aren't a problem, but it's worth getting it checked.

I'd definitely get it looked at...

Get it checked, but you can still run, bike, do weights for your legs etc while it's recovering or whatever.

Do what you can but get it sorted out - these things can become long term if you leave them.