My unweighted GPA is a 2.8 and my weighted GPA is a 3.4. If I keep this GPA for the next three years in highschool would I be able to get into Medical school or no?
High school? You do realize that medical school is a graduate program, right? In other words, you need to be worried about getting into college first.
But to answer your question, no, a college GPA of 3.4 is unlikely to get you into medical school. Your competition will all have close to perfect GPAs, excellent MCAT scores, and medicine-related activities, research, volunteer work, etc.