I should start this off by saying I have had the worst year of my life this year - a cancer scare which required surgery, chronic pain, financial worries and obviously lockdown stress. That being said, I felt this horrible trapped feeling even before this year happened. 
I love DS but his dad has made my life a misery. He just does not take equal responsibility for him the vast majority of the time. He makes arrangements to work etc without even taking DS into consideration -at times he will tell me he can’t have DS because he’d been called into work, giving me literally an hour notice that he will not be coming.
I know the simple option would seem like I should expect nothing from his dad, to avoid disappointment/stress. But that doesn’t help really, when I’ve insisted on him seeing DS for set times, he ends up having him far less. I hate having to rely on him, but I don’t think my mental health can withstand never having a break.
I know this post probably sounds horribly self indulgent. I know DS didn’t ask to be born, I know I am responsible for him, I really do love him and feel close to him, but being the default parent for years has really worn me down. I kept thinking it will be easier once he’s older, easier once he’s in school, but none of it really changed the deep sadness I feel that I am totally isolated and lonely. I miss just being able to go and meet friends for lunch, or do anything fun or spontaneous. Times when DS’s dad has been really involved and genuinely done his share of the parenting have been the only times I have felt like I can actually breathe, although they’re always short lived.
The last few weeks I have felt constantly tearful. I just don’t enjoy my life anymore
I feel like I have lost years of my life to feeling like this. I’m not depressed, I know that if DS’s dad stepped up for good, these feelings of sadness and being trapped would entirely go. I have tried to speak to a close friend about how I feel but it seems pointless as there’s no way out for me. I feel so guilty that I can’t enjoy being a parent more, DS deserves a lot better than me