We all have insecurities.. where human, but i was wondering what your insecurities are and how you cope/overcome them..?

Im having issues pop up and it seems to always flair up when im in a relationship.. its totally my problem but sometime find it hard to comunicate them to my partner, because it seems stupid and irrelevnt to anything hes done but more so my past relationships. So im wondering how others cope with insecurities in general xx