I got my bellybutton pierced about 6 weeks ago and I've changed it twice, but I cleaned it with rubbing alcohol, which I now know wasn't a good idea, but when I grab my belly button with my thumb and my fore finger I can feel like this lump behind my piercing? Like what is it? And how do I get rid of it?

It's probably scarring. I don't know much about piercings, but I think you're supposed to wait 6 months before you change your ring. Unless you start to treat it right, that lump is only going to get bigger.