Question about internships/major.

I am currently taking a leave of absence from a UC (former polisci major) to finish pre-reqs for a physics or CS degree (not sure which yet).

I realize some of these questions can be answered through the school, but I wanted to see what others went through.

1.As an undergrad is it possible to carry on an internship and part-time job? 2.Did you get financial aid over the summer while at your internship? 3.How did you know when you found the right major? 4. CS and Math/CS are impacted. If I don't get into CS (or Math/CS), what would be a good fall back major - physics? Don't get me wrong, I am on top of it, but it's always good to plan for failure...

I've taken up to calc3, mechanics (calc based), C++, and Java. All were interesting/challenging. The main reason why I thinking physics is because it's difficult. The same reason why I joined the US Marines initially. Neither came easy, but I like how hard work changes a person.

Anyways, I keep coming across negative reviews about the physics major - even from some professors. They say go engineering or CS, that's where the $ is at. Those majors can also be pretty challenging from what I've researched, so I am not ruling them out.

I am conflicted because I could care less about what field I go into. Any path will be an adventure and I will enjoy it even if it sucks (thank you Marine Corps :D) I am just getting to that point where I have to choose and there's no clear indication on which path I should take. What do you think?