Looked at your public tree, and you have a little more info:
You have Hendrik Jansen and Janitje Linkbeek as the parents of Helmer Jansen. Now they got married in 1903 so you may be off on your birthdate of 1892. Anyone born more recent than 1903 may not be available yet but you will find tons of stuff on his parents and farther back.
Use this database:http://www.genlias.nl/en/searchResults.jsp
Often it helps to fill in only a few letters and select "Begins" so catch spelling variations. If you get too many results enter more info:
When you find the records in Genlias another great site is genver.nl in it you can find scans of original records.
I attached what I entered to find the marriage record. It may take a while before you get used to using this database.
I think you may have a couple of names mixed up in your tree I found this marriage record:
Source Civil register - Marriage
Archive location Groninger Archieven
General Municipality: Winschoten
Type of record: Huwelijksakte
Record number: 29
Registration date: 30-04-1914
Groom Jannes Bloksma
Place of birth: Heiligerlee gem. Scheemda
Bride Jantje Hilbranda Niemeijer
Place of birth: Winschoten
Father groom Jan Bloksma
Mother groom Tjaaktje Kaman
Father bride Wubbo Niemeijer
Mother bride Aaltje Annechina Kiewiet
Additional information beroep bruidegom: rijwielmaker; beroep vader bruidegom.: brandmeester; beroep vader bruid: metselaar; bruidegom 22 jaar; bruid 19 jaar