a little more power

Work with both, have a solid workout routine. But also work on bat speed. Do an over /under swinging program.

10 swings with a normal bat
10 swings with bat with a donut
10 swings with a lighter bat
10 swings with a wiffle bat
10 swings with the regular bat

do have a workout routine whihc i could use to help?

Describe your lifting program and I may be able to help you improve some areas that you are weak functionally causing the lack of that extra power you are looking for.

my lifting routine is (with a curl bar) curl, wrist pumps, dead lift, sqauts, then using dumbells i work my triceps, i do curls, i extend my arms to shoulder hieght.

Seems that you are doing mostly arm work with some legs. What happened to back and chest workout? Do you do anything for your core (abs, back, gluts)? How do you space your lifting out, like what do you work on monday, then tuesday, etc.?

i also do crunches, sit ups, and push ups, and since it's the summer i try to work out monday wednesday and friday, and on tuesday and thursday i do swinging exercises.

Start doing lunges with dumbbells in your hands. Also start doing some lunges with a twist (step forward and twist toward your lead leg) for more of a balance lunge. Bench press is fine as long as your elbows do not go below 90. Anterior Reaches would be great for you being that your a pitcher. Stand on one foot and lean forward bending at the waist keeping your knee slightly bent. Touch the ground directly in front of you. It will feel real awkard, but its a great balance drill while strengthing your leg assistant muscles. Lat pulldowns and seated rows are good for the upper back. Step ups are good exercises for your upper hamstrings. There are a few exercises. Give them a shot and let me know how things go and if things go well I can give you a few more examples. The last part will come from your hitting coach developing sound swinging technique to bring out your best swing.

Obviously I have not seen you swing the bat but most of the time power in the swing is derived by a few things. One you must have your hips lead your hands 2 you must keep your hands inside the ball and3 you must match the plane of the ball. Its called a rotational swing. If you don't do that all the lifting in the world won't do it for you. Check this out http://www.mikeepsteinhitting.com

IM a soon to be sophomore. I'm 5'7 and i weigh about 100lbs. I would like to be more of a doubles and triples hitter. What should i do to make this happen??

at the start of freshman year i was a singles hitter sometimes doubles, now i weigh 170 and have leg strength, one tip use a -3 and start lifting use weighed bats, to swing in ur free time