You are certainly welcome, and if you show up on pages where I'm paying attention and you make reasonable good-faith contributions I'll do my best to welcome you, including telling other editors to do better if they don't explain themselves clearly.
My point is that not every contributor is as welcoming as I wish they were. This is a very difficult community problem, without any obvious easy fixes, considering that the contributors can be anyone in the world, are pseudonymous volunteers, and nobody is banned from contributing unless they're being quite disruptive.
There is significant room for introspection and civilized discussion, but people also disagree about what articles should say and how, and it's impossible for everyone's preference to be met. If you ask both sides in a disagreement a newcomer to an article might say that a long-time editor of that article is being a grouchy gatekeeper, but the long-time editor might say that the newcomer is e.g. adding nonsense, is not adequately providing sources, is unhelpfully changing the scope of an article with material that would better fit somewhere else, or is outright wrong (etc.). Sometimes both of those complaints might simultaneously have some basis.
My point is that not every contributor is as welcoming as I wish they were. This is a very difficult community problem, without any obvious easy fixes, considering that the contributors can be anyone in the world, are pseudonymous volunteers, and nobody is banned from contributing unless they're being quite disruptive.
There is significant room for introspection and civilized discussion, but people also disagree about what articles should say and how, and it's impossible for everyone's preference to be met. If you ask both sides in a disagreement a newcomer to an article might say that a long-time editor of that article is being a grouchy gatekeeper, but the long-time editor might say that the newcomer is e.g. adding nonsense, is not adequately providing sources, is unhelpfully changing the scope of an article with material that would better fit somewhere else, or is outright wrong (etc.). Sometimes both of those complaints might simultaneously have some basis.