bad breath or just imagining it ?!

Well you can put your hand in front of your mouth and breathe and smell up, or do it on a mirror, or lick your hand. The best thing to do is to carry some mints and make sure you brush and floss after meals (if you can) I'd say it depends, if your sat next to someone talking straight forward it's unlikely but if you face them then most likely.

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This question should be under the general health category. You can just ask someone you trust. If it is mild others won't smell it if they are at a normal conversation distance. If it is strong...You will notice their reactions and even you might be able to smell it. Make sure you are giving yourself very good oral hygiene. If you still feel you have a problem... seek help from the dental, and medical professionals. There could be a physical problem that needs treatment.
Distance will vary because each person has their own sensitivities.

Take your finger, rub it on the back of your tongue, now rub your wet finger onto your wrist and rub the saliva into your skin so it is damp. Now smell your wrist, if it stinks, so does your breath.

scrape a spoon on the back of your tongue,then smell it.if it stinks you have bad breath.

Your poor dentist

Breathe into your hand? haha idk?
just brush your teeth daily and you wont have to worry about it!