To (finally) answer this question: I had the same worries as you after converting. When I finally did bring myself to go to the mosque I found it to be the most welcoming place I ever went to. All the Muslims are brothers who treat each other softly and kindly. And to a non-Muslim who is interested in Islam they will be even friendlier. It would be shocking if there were a mosque that didn't
accept newcomers. I hope you are well on your journey, OP, may Allah strengthen you and all of us.