I agree it's probably nothing to do with the girl and I suspect the type of condom isn't relevant either. You're now almost conditioned to not perform and it really is something you've got to get your head round. It certainly will help if you can talk about it with girl you're seeing as that will take a lot if the pressure off. Spending periods of time using visualisation techniques can help, for example imagining the condom being rolled on your dick and it becoming rock hard. You really have to get over the moment of anxiety once the condom is on and stop the vicious circle.
Improving fitness will obviously contribute to a well being feeling and therefore confidence.
The blue tablet certainly is the easy course and is a dead cert of rock hardness but the trouble with them is you can become psychologically dependent on them and may never be able to perform without them.
Agree, comma gets hard so it's not ED as such just conditioning, sounds more like Pavlov's dog to me ring a bell the dog salivates, in your case at the touch of a condom you lose your stiffy.
As fraser says you need to re-condition yourself or train your brain to welcome the condom, it's gonna be easy for you, trust me
For starters i would go out and buy a few different condoms and some lube.
No wanking or shagging for long enough so you are "gagging for it", since you're young that is probably less than a day, but maybe more we're all different.
Find yourself somewhere you can relax and be comfortable for a long wank without being disturbed, get yourself porn video or anything else you might like.
Open a condom, get a stiffy, put condom on, apply lube and wank yourself off into the condom or even over the condom to assert your mastery.
Rinse and repeat with other brands making sure each time you have abstained for long enough to be "gagging for it", no wanking in between.
Putting the condom on becomes associated with you cumming, a "reward", success.
Other points, getting fitter is no bad thing.
Whilst Khloe is great some variety would also be good, you already know where Olivia lives.