I do not mean to sound overbearing, but there are people who still have a real life.
Actually, it's none of your business what I did in the meantime and why I stayed away from this forum, but since I have nothing to hide, I'll explain why.
Study, family and my girlfriend were one of the reasons why I did not have time for this forum.
So you don't go online at all during your "real" life? Studying, family and girlfriend take up your time 24/7? What changed now? I'm sure many people can go to school or run businesses, deal with family and girlfriends yet still find time to make the occasional post on a forum. You really don't think the huge gap in your posting is something that others should at least be concerned about?
I do not even know why I need to explain myself AFTER I've posted an SIGNED and a VERIFIED message from an old btc address.

As TheQuin just said people do sell accounts with private keys included, but it's still suspicious that you're MIA for years then suddenly decide to come back and start running campaigns. There have been dozens of scammers who have tried to run campaigns and several that have done so successfully. You could just be another one for all we know. You have no history here for years and all the signed message proves is your account isn't hacked but doesn't mean people shouldn't treat you with caution.