I Have Done So Many Bad Things in My Life

"I have done so many bad things in my life that God could never forgive me."

Are you sure about that?
Is it something you say flippantly, or do you really believe it?
I used to believe that back when, but now, thankfully, this is what I found out:
(19) To wit, that God was in Christ, reconciling the world unto himself, not imputing their trespasses unto them; and hath committed unto us the word of reconciliation.

To wit, (to know; to become aware of)
that God was in Christ, (God was in his Son on the cross)
reconciling the world (you, me, everyone else)
unto himself, (God)
not imputing (not charging, not counting, not holding)
their (you, me, everyone else's)
trespasses (sins)
unto them; (the world, you, me, everyone else)
and hath committed unto us (the world, you, me, everyone else)
the word of reconciliation. (believe it and proclaim it to others)
Perhaps that will help you to see, literally, no matter what you have done in your life, God has reconciled himself to you out of his grace and love. As fallen human beings, that can be very difficult to grasp. But then again, it's very difficult to grasp that a Father would sacrifice his Son for others, right? Those (us) that he called "enemies."

(Romans 5:10 KJV)
For if, when we were enemies, we were reconciled to God by the death of his Son, much more, being reconciled, we shall be saved by his life.

Notice the verse says, "...when we WERE enemies..." What does that tell you? It should help you realize that we (the world, you, me, everyone else) are NO LONGER enemies in God's eyes.
So you may be asking, "So now what?" Check this out:

(2 Corinthians 5:20 KJV)
Now then we are ambassadors for Christ, as though God did beseech you by us: we pray you in Christ's stead, be ye reconciled to God.

"..be ye reconciled to God."
Your next question probably is, "OK, how can I be reconciled to God?"

By trusting:
(Ephesians 1:12-13 KJV)
(12) That we should be to the praise of his glory, who first trusted in Christ.
(13) In whom ye also trusted, after that ye heard the word of truth, the gospel of your salvation: in whom also after that ye believed, ye were sealed with that holy Spirit of promise,

"...the gospel of your salvation:..."

So what is the gospel of your salvation? Notice "the gospel" in verse 1:
(1 Corinthians 15:1-4 KJV)
(1) Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand;
(2) By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain.
(3) For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures;
(4) And that he was buried, and that he rose again the third day according to the scriptures:

The very moment you believe and trust in "the gospel" that saves today, you are, "...sealed with that holy Spirit of promise,..." Ephesians 1:13.
God promises to seal you. God's seal cannot be broken.

So there is even more good news for you:
(Romans 8:38-39 KJV)
(38) For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor things to come,
(39) Nor height, nor depth, nor any other creature, shall be able to separate us from the love of God, which is in Christ Jesus our Lord.

That's what it means to be sealed by God! 100% Satan proof!
So please don't wait. There is no reason to. No one knows when their last day will be.

Make today the day of YOUR personal salvation.
(2 Corinthians 6:2 KJV)
(For he saith, I have heard thee in a time accepted, and in the day of salvation have I succoured thee: behold, now is the accepted time; behold, now is the day of salvation.)
Grace and Peace