“But first, why did you get a 2.5?”
This is the main question to ask, and the main thing to fix.
Your first semester of freshman year does matter, but is not as important as the next seven semesters to come. At this point you need to focus on improving your grades. If you do that successfully, then you will have plenty of good choices for university.
You need to pay attention in class and always keep ahead in your reading and homework. Seek out help when you need it. In math understand why things work the way that they do and don’t just memorize formulae.
If you can get your grades up, then you will do fine and one bad semester won’t stop you.