I’m... scared? I think?

I have no idea how to explain what’s going on with me, because I’m not sure I understand it either. I guess you could say I feel numb? I feel like I don’t really have a purpose, like I can’t achieve anything. I feel so out of place, like something’s not right about me. I tell myself that I’m wrong for thinking so, and I’m being ungrateful, because I have everything. Friends, family, a roof over my head, food, money. But I can’t stop whatever it is that I’m feeling. This has been going on for a couple of weeks now. It all started because a thought crossed my mind: “What’s the point anyway, I’d rather just be dead and gone”. The thought really scared me, and for the rest of the day I couldn’t really focus on anything else. I really don’t know what made me think that way, but I’m really scared.