Some of your problems are going to be cumulative. That fuel spill in the nose is going to weaken the structure up there. Landing on a rough, uneven field is going to place additional stresses on that area when you bobble a landing (and you will, more than once!). If you're learning without an instructor, that'll only further complicate your challenges.

Most farms have at least somewhat smooth dirt roads between fields. Any chance of using one of those? The problem there will be in having the necessary skill to land on a narrow strip--you can't get it without practice.