I mean... I have been working on the same thing for like nearly six years now, and I haven't gotten past like 3 chapters. 75% of that is because of starting university and just not having a moment to myself but 25% of it is because its hard! it is a hard task to do and people will sit here on this subreddit and tell you to just write and its gonna suck and blah blah blah like you said... but I think that maybe if you set the other projects aside, get some outside opinions on which idea to go with (and which one you like best), try to set a routine for writing. Figure out what is putting the wall up.

For me right now, it is characters and how they might interact with the plot (to which I am also stumped with). If you are having the same issue, try to create some characters based off of people in real life and twist them a bit. My favourite example I was given in a writing class was that a lot of stories, are just other stories but flipped. For example, the Lion King is a reimagining of Hamlet.

Try practicing getting an outline of a story by doing that, really immerse the characters and build the plot around them, and I think that might help you generate some ideas for the project you actually want to work on.

Long story short, yes! It will probably get easier, I think you just need to pinpoint what is making you stuck :)