I'm Protestant (low-church), and I observe Advent, Christmas, Epiphany, Lent, Holy Week, Easter, Pentecost, and whatever else I care to do. I have a Christ candle in my house which is lit when we're home.
"High Church" Protestants observe the Church (or Liturgical) Year; most "Low Church" Protestants do not. I am an anomaly.
As a self-developed Protestant, there are no requirements for you to "keep" or "observe" any of the Church Year.
Lent isn't about fasting as much as it is recollection and self-reflection. So, you don't have to fast.
Easter isn't about "a good time," but about the working of salvation, and the triumph of God in the world. Since Lent runs up to Easter, the theme is a sober reflection of your failings as a person made in the image of God that contributes to the need for Good Friday and Easter. To keep the season from being overly morose, it ends with the triumphant events of Easter, and then anticipates the pouring out of the Spirit on Pentecost.
So, you needn't feel guilty about not participating. However, you might enrich your life by doing so.