I know rationally health and happiness comes first, but I still can't convince myself.
Don't force it Jennifer, it makes it worse, this uni pressure will be naturally adding to the stress and anxiety you're feeling. Remember a good many of the world's most successful people made it themselves without degrees etc. I am not advocating that as a route, I didn't go and wish I had have done, I was certainly more than capable but... life.
The easiest spiral to put yourself in right now is forced pressure, the body feels a physical "pain" when forcing ourselves to do something we don't wish to do (I'm sure this is right, research if in doubt), but then is relieved once we actually complete said task. You aren't feeling anything that's not perfectly natural, accepting that without self judgement is a good way to ease a little of that anxiety you're experiencing right now.
Also, remember, pressure from others is false, it's only pressure when we allow that exertion to affect us and the reality is they most likely just want the best for you and the colleges results etc. Nothing wrong in that really.
Nothing here is really "wrong" per se and the pressure you're feeling is perfectly normal.
The first step to happiness, isn't forcing yourself to be happy, it's recognising that pressures like this and feeling the way you do right now are perfectly normal and accepting that as a normal part of being human.
To me, you already seem to be of the mindset that you value your education but not at the expense of your overall life, it's just that you're on the journey to learning how to achieve that balance.... throw anxiety into the spin and she can be a cruel mistress at times.
Try focusing on what it is you want to achieve, in a no pressure way, you're a very smart person, if you take the pressure off a little I'd bet a lot that you'd flourish.
All the best with it