Sad (Don’t know why)

I recently left the military and have been up and down with hanging with my church friends/holy friends, and I even been going to work and for some reason, I have this “void.” where I feel like I am not doing enough. Or feel as though I am in a “there is more to life than what I currently see/going through.” my finances is crap. I'm in school, and just honestly struggling all the way through. I think maybe it's sin. So I ask God for forgiveness and repent, but then it's like the feeling just doesn't go away. I stopped going to church. I stopped leaning on my community. My mind is blink, but still feel the void. I think of so much amazing things - sharing the word, having a purposeful job, etc. But then it's like I am back to square one. It's like I see so much people walking in their freedom and filled with joy and I’m like Jesus… why do I feel empty, and give broke-college student vibes? It's like I want to work, but don't want to focus too much on the money/hustle, I want to give, but feel so broke to give. I want to hang with friends, but it's like by myself... I can tell I’m a bit sad/miserable. It's like I have this idea of conquering the world, and helping others, but feel empty that I can't even help myself. When I give people the word or give to others, I feel great, but the minute I’m by myself, it's like dang, Jesus what’s going on? I work at a gas station, and I really don't like it because we are selling liquor, etc. And the people that come in are either: angry, hurting, or you can just see that they are going through it, so I leave work like… Jesus, it got to be more in life than just this. It's like I want to help people, but also feel like I am giving into their habits/sin, and I get the biggest conviction/hurt. I have moments where I can hear someone elses testimony and feel so grateful for him, but when it comes to me it's like dang, what am I doing? What is my purpose? This mentor I had told me I never mentioned Jesus in any of our conversations and basically said I didn't believe and that I will perish, and Imma be real, it hurts because I already do feel alone right now and it kind of made me question even more. Y’all I even fasted and kept breaking the fast, period no longer has been on. I'm craving sweets and salty things like crazy. And no (s*x) AT ALL, and I’m thinking am I so stressed out about my relationship with God that it’s eating me alive😭. I've been stuck between churches and people talk about deliverance but I just don't think I need that again because I already went through it and it was ALOT. I'm just trying to allow the big man upstairs to do it naturally. It's like I’m yearning for God but feel so far away. It's times when I keep seeing everything is demonic, etc. And I’m like bro, I wish I can just live without the thought of thinking like that, but I know in this world... It is sheisty… I don't like my old worldly ways, and want more of Jesus, and I can tell I am up and down, but do my know why… I just wish I knew my purpose 💯.