Hi @Xlombis welcome to this forum. I hope you can find answers in this forums to the questions you've been searching for.
First of all, I would like to say that I have ocd the illness of doubt and of what ifs.
I think I can sympathize. I may not have an OCD diagnosis, but I do struggle with doubt, and I can almost never make a decision (even a simple purchase) without later second-guessing the choice I made and wondering to myself if I should have chosen something else. But having doubts is not an excuse to stay on the fence. We almost never have enough evidence or information to be absolutely certain about our choices, but at some point we do have to make a choice if we don't want to remain stuck in a rut.
I lost faith because Christianity does not make sense to me anymore. I cant understand why God created us, gave us free will but also gave rules that make it impossible to make it to heaven and on the same time, give us the way to heaven through faith. When it comes to faith, isn't natural for some people not to have faith or have faith elsewhere? There are many religions and I cant blame people for having a different religion.
There's quite a lot to unpack in your statements, there are several assertions that are not actually taught in the Biblical narrative.
You say that God "gave rules that make it impossible to heaven", but if you're talking about the Mosaic Law, remember that it was given to Israel about 2000 years after the Fall of Adam. Until the time of Moses, the people lived under their own manmade rules, but they were no closer to Heaven than when God established His covenant with Israel and gave them the Torah, because "all have sinned and fall short of the glory of God" (Romans 3:23).
When Adam disobeyed God in the garden, he had exchanged the glory of God with his own, choosing the path of self-determination and his own ambition over submitting to the boundaries set by God's infinite wisdom. Once that line is crossed, Man has lost sight of himself and who God is. We can no longer see the world and others through God's transcendent insights, but only our increasingly narrow and self-focused views, and this often manifests in stupid and ill-advised actions/decisions that hurt ourselves and others.
The Law was not given to bar people from entering Heaven. It was meant to show how far we have strayed from the people we should have been had we still lived in perfect fellowship and harmony with God's will. As R.C. Sproul once said, "People don't become sinners because they sin, but they sin because they are sinners."
There are many different faiths out there, but if you take the time and effort to actually understand what the faiths teaches beyond the bare cliche of "do good, shun evil" (which is how I see most people generalize all religions), you can make an informed decision about which faith to stick to. If you find the task of research daunting, there's plenty of people (both online and offline) who would happily explain about their faith to you, so you don't have to do everything on your own.
So, all that seems to me that Christianity is just a man-made religion.
I'm not sure how you came to this conclusion, especially given what you said about the Law. If Christianity is truly a man-made message, it is incredibly self-defeating. After all, it claims that, "None is righteous, no, not one; no one understands; no one seeks for God." (Romans 3:10-11)
Assuming that this is true, that would mean that the people who came up with this religion set themselves up for condemnation and instead choose to trust their eternal destiny on the sacrifice of a god that may or may not exist. I suppose it is possible for someone to come up with this line of thought, but I find this incredibly stupid and unlikely to gain much traction.
I still follow Jesus a little from fear and I am like "Maybe HE IS REAL maybe not" but I cant go beyond that and I do not want to start saying prayers or doing rituals from fear.
There are many resources you can find to verify the historicity of Jesus, and from there extrapolate on whether you find Him to be a trustworthy Person to, well, trust him with your life. I agree that you shouldn't be praying or doing rituals as a sort-of "insurance to get to heaven, just in case the afterlife exists." Christianity would teach that God disdains people who "honor [Him] with their lips while their hearts are far from [Him], and their fear of [Him] is a commandment taught by men." (Isaiah 29:13, Matthew 15:7-9)
I encourage you to really read and study the Bible (particularly the Gospels) and pray that you will find the truth.