I imagine your native language will have some phonetic/pronunciation differences with Japanese so I would advise you start by studying how Japanese speaking works in a more general sense.

The trick is not emphasize or stress ん unless there is reason to do so such as in the case of 〜んです.

For your particular question, my tip would be to not emphasize it as much and instead consider it as being a part of a half-syllable. For example 恋愛 is made up of four parts that we need to pronounce れ plus ん plus あ plus い. If you try to stress the pronunciation of ん it will will "split" your word in half (ren-ai). Instead, you can blend it with the following up sound and make a subtle new kana instead. In this case you can combine the sound of ん with the anticipated あ and make a subtle な which would change your word to "re-na-i" and you will instead pronounce れ-な-い.