Hey! Always great to see someone with an interest in the violin but it is extremely difficult to teach yourself an instrument such as the violin withouy a proper teacher. It is easy to develop poor and improper technique which can cause injury to your neck, back and hands but also create problems in the future when attempting harder repertoire and harder techniques. It makes sense that if you have fault foundations than everything else will also fall apart. I would recommend learning some theory and trying to find yourself a teacher as they will help you develop properly and faster.
source: am a violinist!