when I was young I grew up in church and had very strong faith however I always had fear that I wasn’t saved.
Well, this sounds a bit...contradictory. If you had a strong faith, why did you fear you weren't saved? Wouldn't a strong faith preclude such a fear?
When I was about 15 I got doubts and I stopped going to church as my faith in God deteriorated.
Why did your faith in God deteriorate? Was it that you believed in your head that God existed but not in your heart? Did you ever love God and live your life in humble service to Him? In my experience, those who walk away from God typically have never been truly in relationship with Him.
I am now 20 years old and have been back to my old church 4 times in the last month. But I do not feel anything anymore and I can’t take what the pastors and songs seriously anymore.
You chose a particular course and now you've become set in it. Are you surprised? You turned your back on a God with whom I doubt you ever had a real relationship and have lived apart from him for five years. Why would going to church change the antagonistic thinking and attitude toward God you've been nurturing for the past five years?
I think I do believe God is there as I am slightly fearful I am not right with Him but I just don’t feel any connection with Christianity anymore and can’t get it back.
Your problem isn't with Christianity the religion, but with the God of Christianity, toward whom you've set yourself in rebellion. It is not surprising that some part of you not quite totally hardened against God still feels some pang of fear. God doesn't take a person's rebellion toward Him lightly and you must still have some sense of this. Anyway, it is never too late to change your course and embrace, not the religion of Christianity, but the Person of Christ. It is with him you must deal, not with the religion that worships and serves him.
How can anyone be saved after just hearing a message when they know nothing about Jesus or anything in the bible.
How indeed? Ignorance is never a good basis for any choice. And walking with God costs. And so the Bible warns anyone choosing to follow Christ to carefully consider the cost of doing so. God wants all of a person, and He often calls His children to sacrifice and suffer for His sake, just like Jesus did. Walking with God isn't for pantywaists.
In the same way someone could say another person did great things in the past, “who wants this person in their lives now?”.
I understand the point you're trying to make but you're making a category error in your comparison. Jesus was unlike any other person. In fact, he was the one and only God-Man, the singular incarnation of God. And one can have a relationship with him that is unlike any other relationship one can enter into.
I have many problems right now in my life and am not happy at all.
I have no faith and belief anymore. I wish I could but I just can’t.
God offers to all an "abundant life" in Christ. It is a life of sacrifice and suffering at times, but also one of peace, joy and contentment. God did not make any of us to live apart from Him, and when we do, many problems begin to afflict us.
You have faith to believe; you just don't want to exercise that faith in Christ. Why not? What doubts do you have, exactly?