I'll be lifting you up. I want to comment on your statement
I want to be such a strong Christian that it frustrates Satan to even think about me...
When I read that, I thought a story I heard a few months back (I think it was a true story). As I recall, for some reason a high-ranking satanist went to put a curse on someone's home. It turned out this person was a Christian, and the satanist couldn't put a curse on the home. The satanist came back and told one of his associates something like, "If Christians knew the spiritual power they possess, the kingdom of Satan would fall."
Think about it... We're mighty warriors for Christ! So often Satan uses attacks on our minds to make us feel insufficient as Christians, because he doesn't want us to walk in the power of God. But our feelings do not override the truth.
Some good things have been said in this thread. I especially want to give props for the last couple sentences in Mangafanatic's post.
And about blasphemy, like Syreth said, the Bible only speaks about blasphemy against the Holy Spirit not being forgiven. Actually, in Matthew 12, Jesus said that all blasphemy except against the Spirit would be forgiven men. What prompted Him to even bring it up was that the Pharisees were accusing Him of casting out demons by the power of the prince of demons. Basically, they were calling the Holy Spirit, Satan. I believe that this is what blasphemy against the Holy Spirit really is--someone in such a depraved state calling the Spirit of God, Satan.
I've also heard the opinion that blasphemy against the Holy Spirit is any sin that isn't under the blood of Jesus, because the only unforgivable sin is the sin that someone won't confess. I think that can also be a valid opinion, because the blood of Jesus covers our sins, but obviously those who don't accept it won't be forgiven.
I will say that I think as we grow in our walk with the Lord that we overcome certain fears. When I was younger, I used to be more fearful of the end times and afraid that I had blasphemed the Holy Spirit. I really don't worry about those things anymore in my own walk. And I'm not saying that to boast in myself, just to hopefully encourage you that there will be an end to these fears you're dealing with right now. Of course we won't be past all our trials until we get to heaven, but as we go forward in our walk with the Lord, there is an end to these battles, sometimes one at a time. Just know that you are more than a conqueror through Him who loved you.