Can you get to an Aish HaTorah Discovery Seminar? You can get great Chizuk from one of those. Also, remember you are a teenager, and it’s so common for teens to have these questions in general, and sometimes feel a spiritual limbo. You need to find a good friend who is grounded in frumkeit, but non-judgmental who will listen to what you are saying and feeling right now. Someone who can help to inspire you to understand that Yiddishkeit is not just a general spiritual feeling, but that there are very real minutiae and details that need to be followed in order to achieve that spirituality. A blueprint whose minutest details are not followed by the builder, will produce a structure that falls apart.
If feeling and believing were enough, we could all be non-Jews. That’s what they believe, that faith alone is required to be a religious person.
As Yidden we believe that faith must lead to action. Hashem does not need our brachos, nor even for us to follow the Torah. However, He DESERVES that we do all that because He continuously and miraculously takes care of us. He revealed Himself to all of us at Har Sinai, and by following the Torah (especially the part about not eating pizza after just a little meat, and by making a bracha on what we DO eat), we are demonstrating our appreciation and love for Him, and our recogniztion that He is the Source of every single thing we have.
Hakoras hatov is a very serious character trait to have, and that is what every bracha is, a recognition of the tov. It’s not enough to just “feel” it. The ten seconds or less that it takes to make a bracha, shows we appreciate what we are getting from the One in Whose Name the bracha is being made. That is something we need for ourselves, to make us better, more appreciative people. Hashem does not need to hear it. But we owe it to Him and we need to SAY it.