How do you cope with the sadness that comes from disappointing someone you love, but through no fault of your own?

I see myself constantly disappointing my significant other in ways such as crying too much from criticism, not breaking free from my controlling parents and letting them dictate what I do with my life, and my introverted personality type which makes me scared to approach people for help. He always ends up doing everything for me: consoling me, talking to strangers for me, waiting around for me to figure out how to communicate with my parents. I can tell it is getting to a straining point where he wishes I could fix these flawed aspects of myself, but I know my personality and crying are probably never going to change. I wish so much I could be someone else. Someone who was actually lovable and worthy of the time and effort it must be to even put up with me all the time. But I somehow can't stop the tears from flowing. I can't stop feeling guilty when I don't do what my parents want. I have come to realize I am a horrible person. I am not someone who deserves to be loved or have a normal undepressed life.