Learning to Pray with Sincerity as a New Muslim

Assalamualaikum, I come with peace and love and some sincere questions. If I say anything wrong from ignorance, please forgive me. I'm a convert. I grew up in a Conservative Christian home and even did a Bachelor of Science in Bible. Reading a lot, studying the Qur'an, and learning about other faiths led me toward Islam and raised doubts about parts of Christianity and some New Testament material. Seven years after my degree, I accepted Islam, though for a time I kept it private before I felt ready to attend the masjid. Now I manage to go only about once a month. I want to go more, but I get anxious and confused because I don't know the routines, and I don't know Arabic well. I struggle praying in Arabic. I respect the language, and I have memorized the phrases, and I do know their meanings, but when I recite Arabic it sometimes feels like I'm performing rather than pouring my heart out. The Prophet (peace be upon him) emphasized sincerity, and when I pray in English I can express that sincerity more naturally in my native language. My heart and mind align in English in a way I haven’t yet achieved with Arabic. I mentioned this to a few sisters at the masjid and the usual reply is, "Just learn Arabic!" I don't mean any disrespect, but many of those who say this seem to rely mostly on memorized dhikr and short phrases themselves. So I wonder: how do others reconcile the language barrier with the emphasis on sincerity in worship? And how can I become more comfortable with the masjid routines when language is such a challenge? JazakAllahu khairan for any advice and peace be upon you.