My character is ignoring some collisions

My chararcet as colliders. the other objcts have colliders, but my character keeps getting inside of stuff, like walls, the problem i think is in the transform.translate. could anyoune help me?? My jumping its also bugging any gess?? my character code is here:

using UnityEngine; using System.Collections;

public class walkperson : MonoBehaviour { public float velocidade; public float voo; public GameObject bala; public float timeLeft;

 // Use this for initialization
 void Start () {
 }
 
 // Update is called once per frame
 void Update () {
     if (Class1.contadorglobal == 0)
     {

         if (Input.GetKey("w"))
         {
             transform.Translate(0, 0, velocidade);
             timeLeft -= Time.deltaTime;
             if (timeLeft < 0)
             {
                 GetComponent<AudioSource>().volume = Random.Range(0.8f, 1);
                 GetComponent<AudioSource>().pitch = Random.Range(0.8f, 1.1f);
                 GetComponent<AudioSource>().Play();
                 timeLeft = 0.5f;
             }

         }
          }
         if (Input.GetKey("a"))
         {
             transform.Translate(-velocidade, 0, 0);
         }
         if (Input.GetKey("s"))
         {
             transform.Translate(0, 0, -velocidade);
         }
         if (Input.GetKey("d"))
         {
             transform.Translate(velocidade, 0, 0);
         }
         if (Input.GetKey("space"))
         {
             transform.Translate(0, velocidade, 0);
         }