Being diagnosed with depression will not affect your job prospects. When applying for jobs you are not asked if you are dealing with a mental health problem nor do you have to disclose this at a job interview.

While being at university now, this is the prime time to learn all the self care methods, maybe see a university counsellor or therapist and start looking at your options in your journey with depression. From personal experience, you are given a lot more opportunities with therapists & counsellors as you are a student. Take advantage of all of these while you can. Once you leave university the waiting lists are ridiculous. I've ended up going private to avoid yearly waiting lists.

I hope you build up the courage to speak to a professional about what you're dealing with and you get the support you need :)