Hun i felt the same as you before i saw someone for my depression and anxiety.
First, stay away from those online tests, they are pretty useless and just make us feel 10 times worse usually. I realised i HAD to do something, for my son's sake - he was beginning to copy my traits and become anxious when it was obvious i was, no matter how hard i tried to hide it. I had also been steadily self harming for years (only on my thighs after my son was born in the hopes he wouldn't see). Seeing someone is admitting there is a problem... but admitting there is a problem will find you on the track to being problem free.
I knew i had to see a doctor but couldn't face actually talking to him. I made the appointment for a 'check-up and a few questions about how i'm feeling' with the receptionist over the phone and before i went, i wrote a list of the main points i wanted to make/issues i felt i had. When i went in, i said i was ok and that i had things i wanted to discuss but can't explain them properly and asked him to read what i'd wrote. I found this soooo much easier than doing the talking myself.
I decided to take medication for my problems (i was on citalopram for 12 months and came off of it with no problems, feeling much more balanced and able to cope) but i know drugs are not for everyone. Perhaps just getting it out in the open with a professional might help you a little? There are lots of other things to help depression and anxiety disorders that aren't directly related to pill poppping, there's changes in diet and exercise, working out a life plan with steps for you to take to improving how you feel, even just talking to someone neutral once you take that first step won't feel as bad as you fear it will be now.
Of course i know saying is easier than doing, but i was pretty far gone and managed to drag myself back. You DO have the strength within you honey, thinking of you