First-time homeowner needs advice

I'm a first-time homeowner. I've been in this home for about 2.5 years. It's a townhouse in a community of 10 townhomes, so there is an HOA. The HOA fees are low, so they don't cover much. I had an inspection and I knew I had some bigger projects in the coming years, but most of the stuff that was immediate was pretty small. Or so it seemed. In the time that I've been here, I've spent nearly $25K on various repairs. We haven't even gotten to the major repairs that are coming soon (HVAC, roof). I just saw that a leak that was supposedly repaired less than a year ago is leaking again. The front entry door that was replaced a year ago, is coming off the hinge already. The property taxes just doubled. Even after paying a shortage of $5000, my mortgage still went up by $300 a month. I'm just wondering at what point do you cut your losses and sell? I haven't lived here long enough to build up the equity to replace the $25K I've already invested, so it would be lost, but I'm afraid that I can't keep up with these costs.