love is sefless and lust is selfish right?
Yes, you are correct.
is lust a unnotcied subconscience feeling? or can you tell if your having lustful feelings/thoughts?
We can tell. The devil, the world and our fallen state gives us those lustful feelings/thoughts.
The only way to combat them is to pray and read the Bible. Here is some advice:
As for bad thoughts, evil spirits speak to us in our own voice. If satan can change into an angel of light (2Cor 11:14 KJV), then he can change his voice.
Your brain must stay active and it must abide and remain in Christ throughout the day. Do not give into passivity. Being passive in our minds is the devils play ground. Do this in your mind; praise God, pray and think about verses because the Word of God is active (Heb 4:12 NAS).
Here are some verses:
Isa 26:3
Thou wilt keep him in perfect peace, whose mind is stayed on thee: because he trusteth in thee.
Rom 12:2
And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God.
2Cor 10:3-5
3.For though we walk in the flesh, we do not war after the flesh:
4. (For the weapons of our warfare are not carnal, but mighty through God to the pulling down of strong holds)
5. Casting down imaginations, and every high thing that exalteth itself against the knowledge of God, and bringing into captivity every thought to the obedience of Christ;
Phil 2:5
Let this mind be in you, which was also in Christ Jesus:
Phil 4:7
And the peace of God, which passeth all understanding, shall keep your hearts and minds through Christ Jesus.
Phil 4:8
Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good report; if there be any virtue, and if there be any praise, think on these things.
Eph 4:12
For the word of God is quick, and powerful, and sharper than any
twoedged sword, piercing even to the dividing asunder of soul and spirit, and
of the joints and marrow, and is a discerner of the thoughts and intents of the heart.
Eph 4:23
And be renewed in the spirit of your mind;
2Tim 1:7
For God hath not given us the spirit of fear; but of power, and of love, and of a sound mind.
1Pet 1:13
Wherefore gird up the loins of your mind, be sober, and hope to the end
for the grace that is to be brought unto you at the revelation of Jesus Christ;