only do CBJ as their choice.  For me, it's just the opposite, if a provider doesn't offer BBBJ, I do not see her.  What you do is totally your choice.  However, if you are a provider, you will cut out some potential clients, like me, but it is your choice.  If you are a hobbyist, simply bypass the providers who do not do what you are interested in.

I can't say if you are worrying too much, there are risks in many of the activities we partake in, catching an STD is just one of them.  Do what you are most comfortable with, no one will look down on you, it's your choice.

Swim

Where everyone agrees it's too dangerous to let a woman wrap her lips around your dick for fear of catching something from her saliva, I for one will give up sex altogether and concentrate on my stamp collection.

and do a search on the subject of BBBJ safety, you'll find links to the CDC website with stats on STD transmission from BBBJs.

The upshot is:  There is some risk, but no where near as high as with BBFS.

I'd say 90+% of hobbyists go for BBBJ, I among them.

Now with that said, two things:

I have occasionally met gals whose CBJ skills are so great that they rival if not exceed most gals BBBJ skills, so try it with a condom and see if you find it satisfying enough.

Also try non-invasive sexual activities such as Russian (sex between well-lubed up tits), or Italian (sex amidst well-lubed up ass crack).  You can also find similar crevices on a gal's body that are satisfying not just for the physical pressure and pleasure they can bear, but for the kink factor as well.  Lately I've found underarms to be quite charming, for example.  Thighs are another example of a lovely place to come.

Safe sex can be an awful lot of fun with a little imagination.

We have hooked up a few times with a couple that are MDs

Oral, no covers for either guy. Full sex and you can see their medical training as the condoms go on