Anxiety , relationship issues. Can't i?

I have been suffering from excessive thoughts and anxiety about love, relationships, marriage, physical intimacy, and having children for quite some time. These thoughts do not come intentionally; rather, they suddenly start even from ordinary events in daily life. For example, while watching a teacher's lecture or even just seeing someone normally, my mind starts thinking about their personal life, relationships, and family. Then I compare myself with others. It feels like others can accept these things very naturally, but why can't I? Many questions and fears also arise about my own future. I keep thinking over and over about how I will feel about marriage or physical intimacy in the future, and whether I will be able to accept them naturally. When a thought comes to my mind, I over-analyze it, search for answers on Google, and try to convince myself. But even if I get relief for a while, new questions arise again. please give general support at least that i feel better without any