Assalamu alaikum ustadh. If I miss Salah from time to time despite having the intention not to and I try to get closer to Allah but falling behind, can't fix my life Are people like me destined for hellfire? Any hope?

Don't fall into these negative thoughts and OCD; they are a distance to the hellfire. Do your best, depend on Allah, and constantly seek forgiveness. Don't fall into the nonsense of thinking, "Oh, I missed it, I am not able to." Yes, you can. What about the people who always pray their prayers? How can they do it? They do it because they are very keen on it, and they take the necessary means to pray on time: they put reminders, they sleep early, and so on. So fix your life, Barakallahu feek.