A lot of times when a vampire newly awakens they end up auto feeding to try and fix their cravings and needs. There are many issues and dangers to this. It is highly unhealthy and really does nothing for the person outside of a psychosematic thing. It may make them feel better to them but it really is not getting the body what it needs.
Outside of not getting what the body needs and it tricking the mind into a placebo affect there is also the issue of self harming. Self harming can cause many issues on its own even without the bodies needs not being met. It is why you hear so much about how auto feeding is a big no no.
Although it can be tough to find ways to get what you need there are options available to the new vampire. In this day and age it is not as difficult as it used to be. A lot of times you will also hear them say they will not do animal blood. Although i can understand the reasons why, it is still better to do animal blood which you may not agree with as opposed to auto feeding.
Animal blood as I said can be an alternative. But in the end finding a donor is the best option. Just make sure one is following the Donor Rights and being safe and asking for permission.
Resource for helping with self harm can be found here. As sometimes it can continue or become an issue for one who starts.