Congrats! While no one loves their job 100% of the time, you seem to be in a good place with your current position. Every new job takes some getting used too, but you seem to be actively engaged with your current company and learning the ropes. Make sure to keep up your positive relationships with your coworkers and openly communicate if you do have an issue and it'll definitely pay off!
Looks like it's time for some office therapy. Just like with romantic relationships, its important to actively put effort into improving your situation at work. Rather than jump to resigning, add more spark back into your routine by seeking out more responsibilities and learning opportunities with your managers and meeting to discuss your long-term career goals.
Break-ups are hard, but sometimes it's the best option for everyone involved. You've moved passed the slight annoyance and are actively dreading getting up Monday-Friday its time to move on. Your work-life takes up the majority of your time, it should be interesting and rewarding rather than emotionally draining. Seek out a positive company culture that allow you the opportunity to pursue your passions to the fullest. Change is always scary, but there's nothing better than finding that job you love!