Did therapy/counseling really help?

I've never gone to therapy before but have always wanted to try it... I guess I was too shy about doing it? But I am growing more and more depressed and lethargic this year in particular. I am blessed enough to be able to stay at home unemployed thanks to my loving and supportive husband, but that's also partly because I just can't seem to be able to stick to one job for a long time anymore (which is so unlike me, I've been working part-time and full-time ever since I was 14). I am almost 30 now, and everything is provided for, we have an apartment and car, no kids, we aren't in debt, I have nothing to complain about in my current life. But I am not happy. My past issues with my family makes me feel guilty and worthless all the time even when I'm not doing anything wrong, I'm so sensitive to everything and everyone, I feel like everything's my fault, I have anger issues now, all I do is sit around on the couch looking at my phone for all my waking hours. literally like 16 hours straight.  And I can't sleep. I fall asleep at 5am, sometimes later. I feel like a useless piece of shit and like I don't deserve all the nice things my husbnd does for me. I used to be such a hard worker, never got an allowance growing nor asked my parents for any help, I was so independent and confident in my early 20s... now I can't concentrate on anything for too long, and working with incompetent moronic coworkers recently has NOT helped with my anger levels. I used to be the "nice" funny girl everyone didn't have any problems with. Now I have a hard time not being a debbie downer, and when a friend pisses me off too far I just cut them out, coldly and abruptly. My patience with people in general has become so short and cold. 
Anyway. Does therapy really "fix" things like this? Is it worth the money? I'm looking online and see some nice websites that I'm thinking of signing up for (like BetterHelp). What is a therapy session like? Do you feel like theyre actually listening to YOU and not just another customer? Any input about your personal experience with counselers and therapists would be nice. Thank you.