Firstly, I am sorry to hear of your loss. Losing a parent is difficult whatever age you are, and you aren't very old, it seems.
Now is the time to get support from family and friends. Try not to be annoyed when people say they know how you feel, they probably mean well but don't know how to express it.
It might help you to find people who have experienced a similar loss, either online or in real life. It helps to talk about your loss, and to remember the person you lost, the good, the not so good, the funny episodes from childhood. All of it. See if there are any support groups around you if you feel your friends don't understand. Local hospitals, hospices or funeral homes might be able to tell you if there are such groups.
If you are of a religious persuasion, it might help you to connect with your church.
Its going to be a bit of a roller coaster, with ups and downs, for a while. Gradually it evens out over time. Don't ignore your feelings or think they are wrong. And look after your physical health, don't self medicate to cope. That will only give you another set of problems.