You've admitted that you are young and haven't been around for large scale issues and deep seated treaties and ally-ships that lead to the development of global political issues. It is incredibly understandable that given your age and experience you've summed up your decision into what you've currently seen in the news and perhaps the few bullet-point-history issues you've read up on.
The issues going on with Israel are enormously complex and are not as simple as who's land it is, who is keeping who away, and who is committing genocide. Yes, it is horrible, and it would be ideal if our political leader could step up and call out that country for those actions. The unfortunate reality from a geopolitical perspective and from the strategic perspective of being a world leader that needs to think many, many steps ahead is that the middle east is a very hostile area, and Israel is very strategically placed to not only have an ally, but also to keep key ports open - both for economic and military reasons.
Making a statement against the actions of Israel would have been detrimental to future global peace options. Instead, Biden can work with Netanyahu behind the scenes without making an official statement.