I can't tell if I'm depressed or not

Hi everyone, this is my first post here, and honestly I'm just very confused about life in general. I can't seem to find happiness in anything I do anymore, and I just feel blue all the time and have a ton of crying episodes. I can't tell if this is just a phase or if I am genuinely depressed. I'm 23, just got into the work force, which has been a total lifestyle change I was not expecting, and I'm currently going through some friendship troubles and have been dealing with a long term relationship breakup for the past 7 months or so. To add on top, a great friend of mine has just been diagnosed with cancer, and I honestly and just struggling to handle all of these relationship changes, routine changes, and just overall anything that changes. I can find moments of happiness but whenever I am by myself, I just instantly go into this mode of feeling blue and worrying about everything. I don't really know what would be the best action to do next. I realize I have an issue, but I can't tell if it's depression or what.

Thanks