The strength of your connection is irrelevant, I'm afraid.That's because it's peer-to-peer. The entire chain is the strength of the weakest link. You may have 10-20ms of latency to your local exchange, but you're not sending information to your local exchange - you're sending it to Europe.
Let's talk about the speed of light. Any information you send is limited to it (it's a rule of the universe) and commonly doesn't get near that due to processing times.
You say you're "East Coast USA", so let's be kind and assume you're in New Jersey, where the transatlantic cables arrive/leave the USA. Let's be also kind and assume that the people you're playing all sit on top of the exchange in Katwijk in the Netherlands. We can assume the cable is laid on the great circle between the two points, because it is.
It's 3,630 miles from Jersey City to Katwijk. Your information has to go down it (and back). It takes a few tenths of a millisecond at each end to get information from computer to exchange (and back), which we can ignore. 3,630 miles at 99% the speed of light is 51ms.
So now we have information from you being sent across the Atlantic to eleven guys in Katwijk. Their consoles see you where you were 0.05s ago and you see every one of them where they were 0.05s ago. Fun fact - your HD display refreshes every 0.01s, so you're five screens old and so are they. And because it's peer-to-peer, they're all five screens old to each other. At 100mph, those five screens are seven feet - you're seven feet away from where they think you are, and they're seven feet away from where you think you are.
Now we drop you out of the network. They're running through a local switch atop the exchange. They have a latency of 1ms to each other - 0.001s (1.8 inches) - and what they see on their screens is live, without the American dragging them down. They don't know it when you're in there, but they'll sure notice it when you leave.
Can you see that you're lagging and harming their lobby simply due to geography and physics? And that's optimised - the reality of it is you're running much nearer to 100ms (0.1s, ten screens, fifteen feet) of latency and if you're West coast you can forget it.
And you don't have to believe me either, even though I've taken time to explain it. Go to Pingtest.net. Don't select your local server - pick Manchester in the UK. If it's much less than 120ms with a 10ms jitter, I'll be surprised. That's your latency to Europe. At best.