so my problem is not with pronouncing the "th" sounds, but with pronouncing it when it's in the middle of a sentence.

i find it easy to pronounce any word that starts with a "th" or ends with a "th", but when it comes to words like: anything and everything, its just too difficult for my tongue to go fast enough between my teeth...

im not having that problem with pronouncing it at the beginning of the stentence or at the end,

only when it's placed in the middle (of the sentence), and then i need to make alot of effort to make that sound...

would it be horrible if just pronounce the "th" sounds in those words (everything and anything) like an f?

i know worry too much, but i like to speak properly...

thank you in advance!

If you can pronounce TH in the word "thing" when "thing" is a single word, then you are already very close to winning the TH-battle.

I would suggest launching your final attack by practicing two single words:

- every

- thing

Say each word as a single word, first "every" and then "thing", and repeat that again and again. Start with a very slow speed and then gradually increase your speed. When you get to the point at which TH starts to give you trouble again, slow down just a tiny bit and then keep repeating at that slightly slower speed. After some more practice, try to increase you speed in very small steps again.

The TH sound is typically one of the last sounds that native speakers of English master when they first learn to speak. It's not an easy sound. But with practice and determination, it will come.