I'm a senior college student in my second year of Latin studies currently slowly and painfully working through Wheelock's Latin Reader
My experience with language (albeit not really with Latin, more with French and German) tells me that the more you stick with it, presuming you actually like it, the better you will become. At some points in my language learning career I've one day thought that my struggle was getting no-where, and the next day something would just click, and I'd be fine again. So, if you're enjoying Wheelock, then carry on with it.
If you're not, however, I would recommend (and I'm sure many others here would, too) that you look into Ørberg's Lingua Latina. It is an immersion text written entirely in Latin and you get new words from context and margin illustrations. Perhaps asking on here about it a little more, or reading about it on the net, would help you decide whether it was right for you, though. You can order it and read about it on amazon or http://www.pullins.com
- directly from the publishers. I found that amazon were very slow delivering it, though, so perhaps try the pullins website? Being in your second year, I don't know how good your Latin actually is, as I never did Latin in school, unfortunately. I think, though, that you would eventually come to a chapter in Familia Romana (the first main text) where you would feel challenged. If not, there's always Roma Aeterna, which is the second text.
I hope some of what I've said is useful to some degree. Good luck.