Hey Olaf
Welcome to the forum, and well done for taking the brave step of asking for feedback on your song.
As Richy says, you have a good ear for melody, and very natural vocal phrasing, which are two very important aspects of songwriting.
I think the two main areas that need work on this song are structure and dynamics. Although your song has some dynamics, where the strumming changes to picking etc, there's not been enough consideration about how it's used. The song feels a little undirected and lacking a definitive moment.
Which leads to structure. Generally, a song is easier to listen to if it has quite clearly defined sections: verse, bridge, chorus etc. My advice to new songwriters is usually to listen to and learn lots and lots of great songs. And when I say great songs, I don't mean just what's popular now. Do some research, find out who the great songwriters are, and make it your business to learn their work.
Here's a head start: Paul McCartney & John Lennon, Elton John, Paul Simon, Joni Mitchell, Carole King, Neil Finn.
But there are loads. You could spend the next 5 years just ploughing through those artists' work alone.
An excellent start Olaf; keep it up, and stick around