I’ve been through this exact same thing. A priest refused to hear my confession once because I was too emotional and honestly it was hard on me. It was very hard for me to make myself go there in the first place (legitimately almost impossible and months in the making) and I was doing my best, but it wasn’t good enough. I struggled with this for a long time and it led to me having really severe anxiety related to confession. I couldn’t even think about going, much less go, and then I stopped attending mass because, in my eyes at the time, I didn’t see a point if I was always going to be in mortal sin. I felt like God didn’t love me or want me in His church or else why would He let me get turned away like that?
Let me just say; is is SO DIFFICULT to move past this. I work at it every day and am trying to regain the trust in God I lost after that incident. It does get better though - slowly, but better - so I encourage you to not give up. I recently encountered a priest who was so kind and so patient with me and that has totally changed my outlook and has given me so much hope I will one day fully return, body, heart, and soul, back to the Church. All will be well in God’s timing - and His timing is always perfect.
In regard to committing more sins: it’s easy to fall into the rabbit hole. The more you commit, the more you will stop caring. The more times you commit a sin, the more habitual it will become. This will only make it harder once you eventually come to your senses. Please, I beg you, don’t do this. It’s so tough to get out of and there is nothing I regret more.
God bless you.