Razia was signed to the team to replace Timo Glock, but his contract was terminated after just 23 days when a sponsor failed to keep to Marussia's contractual agreements.
"I'm in a kind of shock, because you expect to be in F1, you are there, announced, testing, and then you are out - and not because of a driver fault," he told Autosport.
"I did everything right in what I could do, but it was really just a circumstantial thing that happened, and that was it.
"But I still am here. My career is still shining and I can overcome this difficult situation. It is just something that has happened to me. Sometimes life does this to you. My main goal is to be in F1, so all my effort is there. I am now without any grounds, but I will go with my family, and we will be sad for a while, but I will get back to the category."
Razia drove in the first test in Jerez for the team and insists he has no hard feelings towards Marussia or his replacement, Jules Bianchi.
"I could be angry. I could be very selfish, but I am not. I am really tolerant with these things," he added.
"I understand the position of Marussia and I like the team. They treated me very nicely there and, to be honest, they were trying to sort out the situation for me. They chose me because they wanted me there in the first place, so there are no hard feelings. It is also fair to say that Bianchi had a difficult situation and, to be honest, he deserved the drive."
Razia, who finished as runner-up to Davide Valsecchi in GP2 last season, will now evaluate what he needs to do to return to the sport.
"I will see what is best for me now and put together what I need to be in F1. For now, I just need to regroup my thoughts," he said.