I like port but I had to give it up - it gave me a headache. While port is technically a wine the addition of a distilled spirit like brandy 'fortifies' it and amps up the alcohol content. With the high sugar content, port is usually regarded as a dessert wine.
Straight (non-fortified) wine is much lighter than port and has a lot less sugar. If you prefer the sweetness of port most reds and whites may be a little too dry for your taste. You might like some of the sweeter German white wines
@Red Gold is going on about - Moselle, Rhine Riesling, Riesling, Traminer Riesling. If you want to go a little drier try a Sauvignon Blanc (great with fish or lightly flavoured chicken).
I'm not a fan of wine as a recreational drink - I prefer to drink it with a meal.
OB