Figure I'll chime in here since I have the same physique you described almost to a tee.... big triceps, delts, traps, no chest, narrow shoulder girdle
When I was younger, in highschool, I looked really silly. Very skinny with very oversized traps relative to my size, and no shoulders to speak of. I got some bad news for you, alot of it is genetic, and if it's a bone structure thing, there is only so much you can do about it.
I've been lifting for 3 years now, tried a buncha different splits, as well as the 5x5, and regardless of what lifts were going well and what ones weren't, I alwayus pretty much looked the same. Any change was simply due to eating more or less, but body shape stayed the same.
The best advice I can give you is simply to hit the compounds hard and eat eat eat. The only way to really solve the problem is to get bigger all around... trust me, you will look better, and the bigger traps will only enhance your look. Trust me, alot of guys would kill for big traps.
You don't have to work traps directly. I never did, they tend to get hit with deads, cleans, rows quite a bit anyhow. Maybe others can help with isolating lagging muscle groups more (chest), but for your shoulders, trust me man, keep up with the compounds hard n' heavy, and eat , then eat some more. You will notice improvements over time.