The aim of the present thesis was to gain insight into the characteristics of the romantic relationships of high school graduates and to examine the role of some aspects of adolescent romantic experiences, the quality of romantic relationships and romantic self-perceptions in understanding the internalized symptoms of youth. The research was conducted through an online survey posted on the Google Forms platform and it was available from April 26th to May 24th, 2021. The convenience sampling consisted of 140 high school graduates from Zagreb. The quality of romantic relationships was measured by the Romance Qualities Scale (Ponti, Guarnieri, Smorti and Tani, 2010), while the level of severity of internalized problems was measured by a shortened version of Depression Anxiety Stress Scale (DASS-21) (Lovibond and Lovibond, 1995). In addition, for this graduate research, a demographic part of the questionnaire was constructed. Apart from demographic characteristics, it examined some aspects of romantic experiences of Zagreb graduates, such as current relationship status, general romantic relationship satisfaction, frequency of dating experiences in the last 6 months and the means of an acquaintance of current and potential romantic partners, as well as the experiences of verbal and physical violence in romantic relationships. Furthermore, to examine romantic self-perceptions, defined through the perceived importance of romantic relationships, participants were asked about their perception of the impact that romantic relationships have on their mental health, the importance of the former and the impact that romantic experiences have on self-concept and their self-esteem. The results suggest that most of the high school graduates involved in this study have been in a romantic relationship for more than 6 months. Participants were generally well satisfied with their relationships and rated them as high-quality. Furthermore, most participants in this study believed that romantic relationships affected their mental health, self-esteem, and their self-perceptions. Regarding the role that romantic relationships play in understanding adolescent mental health, no association was established between the ‘relationship status’ itself and outcomes on the subscales of depression, anxiety, and stress. Nevertheless, a low positive correlation was found between the results on the conflict dimension and the results on all three subscales of The Depression, Anxiety Stress Scale. Low negative correlations between the dimensions suggesting a higher quality of romantic relationships and subscales of depression, anxiety, and stress were found only in a sample of girls.