You don't "need" to bench. But, you can do alternatives like dumbbell bench, Cybex (or machine) bench press, military barbell press, military dumbbell press, Cybex (or machine) military press, dumbbell flys, pec deck (machine that simulates dumbbell flys), dips, incline barbell press, incline dumbbell press, decline barbell press, decline dumbbell press.
My suggestion is to set yourself long-term and short-term goals. If you choose to go with bench press, set a long term goal like doing 225 lbs for one rep in two years (this is an example, not actual). A short term goal might be bench pressing 135 lbs. for 10 reps in one year. As you reach each short-term goal, set another short term goal. One short term goal might be to bench press your weight for one rep. So that could be 180 or 185 lbs.