I hate my hair

Idk if this is the right place to put this kinda thing but I just need to get it out there. I hate my hair, I just feel like it’s always too stringy, thin and greasy constantly. It’s always been like that even when I was younger I just ended up cutting it short constantly because anytime it down to my shoulders it would just get too thin and weird. I feel like I’ve tried everything and nothing works. Don’t get me wrong I’m not in the best physical state with type one diabetes but I dont think that has anything to do with it. At this point I’m just considering hair extensions or something. But at the same time I feel like people would judge if I all of a sudden just showed up to work with longer hair? Can anyone give me any tips or suggestions on what I should do?