Hey There, Soccerstar!
Welcome to the forum. I'm fairly new here myself, and your story is not all that different than mine, or most other folks' for that matter, when we first found the forum.
Unfortunately, since your eBay accounts were not "stealth" there are all sorts of ways that eBay or PayPal could have linked them. Chances are you probably provided that cell phone number to one of the two at some point back on your old account. That's okay, lots of us didn't know any better either when we started our first accounts, so did the same thing.
I think the first thing you need to do is some simple damage control:
1 - If you have access to any funds in any PayPal accounts, withdraw them now!! Otherwise you can kiss them goodbye.
2 - Determine what risk you face from eBay/PayPal. There are lots of threads on what happens when you don't pay your fees (use the forum search function to find them), but if PayPal or eBay have your real bank details, chances are they will try to withdraw some or all of the money you owe them at some point. You should close those accounts ASAP to keep your money! Chance are though, at some point if they have all your real details the money owed will go to a collection agency. How you choose to deal with it at that point is entirely up to you, but relax, you're probably not facing any criminal charges here (unless you were selling ⊗⊗⊗⊗ items, etc).
3 - Login to both of your old eBay and PayPal accounts right away, and make sure you copy down all information you've used with them (name, address, credit cards, user IDs, passwords, bank account information, IP, etc.) so you can make sure you NEVER use any of that info again. Once you do that, forget about these accounts; they're dead to you, and you should never login to them again.
4 - Buy the eBay
Stealth Book from this forum and read, read, READ it! Once you think you know all there is to know, READ IT AGAIN. This book will show you how to properly setup your account to avoid this in the future. Consult the book first, and then if something seems unclear, or you still have questions, come back to the forum, and then SEARCH for your answer. If you still don't find it, THEN post a new topic asking for help. The folks here are great and keen to help, but they've answered the same questions over and over, so they REALLY appreciate you using the search function first.
Lastly, calm down and take a deep breath. I know (personally) how horrible all of this seems, but with a little hard work, you'll be back up and selling (the RIGHT way) very soon!