You need to know the following pronouns, in either the "subject" role, or the "object" role.
Find here the table of subject and object pronouns
In particular, when it concerns yourself:
Jag:
- used when I do the action, when I am the subject of the verb in the sentence
- jag äter (I eat / I am eating)
mig:
- when the action concerns myself, when verb is reflexive
- jag ser mig (I see me - = myself)
min:
- to indicate something is "owned" by me, or "relates" to me.
- min syster (my sister)