Cooking a special meal complete with candles and soft music is a romantic gift to you both and one that will deepen your connection.
Knowing your beloved will think of you whenever they listen to your collection is a really good feeling and if it hits all the bases in terms of romance, thoughtfulness, happiness and sharing then it’s a gift that will always be treasured.
Spending money you can’t afford on something to impress your date is not going to strengthen the relationship, instead it will weaken it.
Being authentic and spending time with your date is probably the most precious gift you can give.
You aren't that serious yet, so preferring to spend a birthday with friends is totally normal. Possibly, your date will mention a party or get-together to which you'll be invited.
If you go, treat it as you would the birthday of a friend you very much like: bring a card, buy them drinks, etc.