One one hand, sticking at it is very character building. My time at Uni was probably the time I matured the most. I became so much more independent, and learned to think for myself. It gives you soft skills and something for your CV. If you get your degree and then go into flight training, you have that additional feather in your cap of life experience and maturity. Bear in mind that the majority of Integrated school graduates don't have degrees or work experience, so you'll definitely have the edge in an airline interview.
On the other hand, if your heart's not in your Uni course then you'll have a long, hard three years. And the course won't get any easier. If you were in your second or third year, I'd urge you to stick at it. But, the first year's a different beast. It's the lowest pressure, and the most enjoyable. If you can't crack it now, you won't have a chance in the second and third years.
It's a very, very difficult one which only you can assess and make a choice.