<p>Well, let’s be honest. You ARE slightly behind in the mathematics side of things. This is not going to kill your chances in physics, but it is going to mean that you would need to work a lot harder initially. Having just an introduction to calculus in high school is very beneficial. </p>
<p>Right now, I am reading your post and you mention that you have an “interest” in theoretical and quantum mechanics. Where does this interest stem from? How far have you gone to look into this interest? For someone who has taken 1 semester of a high school physics course in their life, I have to question how strong this interest really can be.</p>
<p>Lastly, before you dive deep into saying you want to be a physics major, I would definitely take the first two courses (Mechanics and E&M). I find that physics unlike many subjects, requires you to be of a very particular breed. Some people have the mindset, some people just don’t no matter how hard they try. So I’d give it a try to see if you really do like it. It took me two semesters in college to find out that this was where I belong.</p>