Confused about classes.

Right now I’m at a community college. After this year (second year) I’m transferring to a university. I recently changed my major to nursing, from clinical lab science. Recently I just found out that I’m taking classes I actually dont need, plus with me changing my major I don’t think the classes I’ve taken so far is what I need for my program. Now I feel like I have all these classes that I don’t need and I’m just wasting my time.... not only am I feeling discouraged but will this weaken my chances of getting into nursing at all? I plan on scheduling a appt with an advisor at the university I want to attend. Instead of going into the university as a junior, I’ll be going in as a sophomore. I plan on catching up on all my classes and also retaking ones I feel like I didn’t do good enough in. I just feel like this is a load and I’m not doing good at all and Its going to take me forever to graduate.