One of the most fundamental misunderstandings about the Gospel is that Christians believe we are "good" people, and thus are going to Heaven, and everyone else is "bad" and thus deserves Hell. The stereotype of a Christian is a pride-filled hypocrite who believes himself to be somehow "better" than everyone else, and that's why we're going to Heaven.
The reality is that God does not discriminate. The Bible tells us that all have sinned and fallen short of the glory of God (Romans 3:23), and that this ultimately means even our righteous acts are filthy rags (Isaiah 64:6). Even a mature believer, supposing he had been in the faith from his youth, and now well into his 80s having never spent a day without serving God, could not possibly claim he has no sin (1 John 1:8). Long story short, a Christian is no better, and may even be comparatively more wretched than an unbeliever.
You may be familiar with the song "Amazing Grace". Written in 1779, this popular hymn remains on the lips of millions of Christians alive today. Pay attention to the first verse: "Amazing grace! How sweet the sound That saved a wretch like me! I once was lost, but now am found; Was blind, but now I see." John Newton, as a slave trader, was certainly not lying when he called himself a wretch. A history of violence and rebellion that would make many of us vomit meant this man certainly did not deserve Heaven.
Just like Newton, Paul recognised his own depraved state. In his powerful testimony found in 1 Timothy 1:12-15, he concluded "This is a faithful saying and worthy of all acceptance, that Christ Jesus came into the world to save sinners, of whom I am chief." In this passage, Paul describes his sins as a "blasphemer, a persecutor, and an insolent man", which according to the rest of the Bible is actually a rather tame description. His persecution included murder, and not even a quick and painless death. If anyone deserved Hell, it would be Paul.
In verse 16, Paul describes the reason he was shown mercy: "However, for this reason I obtained mercy, that in me first Jesus Christ might show all longsuffering, as a pattern to those who are going to believe on Him for everlasting life." Jesus didn't specifically single out Paul for salvation because Paul deserved it, but because he didn't. Jesus saved Paul, the chief of sinners, so that He could show all longsuffering. So that He could say that whoever you are, whatever you've done, all of it was paid for by none other than Christ Himself.
And so, to you unbelievers, I say this: no. I am not perfect. I do not deserve to go to Heaven. But more importantly, I say this: Neither do you. You may not be a murderer, like Paul. You may not be a slave trader, like John Newton. Perhaps you're not even a lustful, covetous, angry glutton, such as myself. But when your time comes to face God, He's not going to judge you by what you haven't done, or by what anyone else has done. He's going to judge you by what you have done. Now, you and I both know how that would go down if it happened 5 seconds from now. In your own heart, you know that you're not perfect. You know you've done things wrong, you know you're doing things wrong, and you know you're going to do things wrong. Maybe even at this point you don't care. Maybe you like the evil in your life, and you've no desire to change. Point being, regardless of how imperfect Christians are, you yourself are too imperfect to stand before a perfect and Holy God, and there is nothing you can do to change the fact that you have fallen short enough of His Holy standard to receive His Holy wrath.
However...
There was one perfect man in human history. This man knew no sin, and because He knew no sin, He deserved no punishment. But God did punish Him, not for anything He did, but for everything you have done. It is not through your "filthy rags" of righteousness that you can go to Heaven, but through faith in His sacrifice. I encourage you, therefore, to take a moment to humble yourself before Him, acknowledge the fact that you have sinned against Him, and ask Him to forgive you for it. If you do that today, you will not receive the wrath you deserve in Hell, but the reward He deserves in Heaven.